I had 80 SEPA refund emails to write in three languages and no trilingual support staff
I sell refurbished kitchen appliances—espresso machines, stand mixers, the occasional Thermomix—through my own Shopify store and on Bol and Zalando. About 40% of my orders ship to Germany, 35% to France, 25% to the Netherlands. When someone returns a machine, I need to send a refund confirmation email in their language. The email has to explain the SEPA timeline (usually five to seven business days), confirm the amount in euros, and sound like a human being who cares that their Gaggia Classic arrived with a cracked portafilter.
For two years I used Google Translate and a template. It worked until a French customer replied to say my email "sounded like a parking fine." A German buyer asked if I was a bot. I knew I needed better translations, but hiring someone fluent in German, French and Dutch to write eighty refund emails a month would cost me €600 minimum, and I'd still be the bottleneck—they'd need my notes on what went wrong, whether we're sending a replacement, if the customer was polite or furious.
I decided to test three AI models: Claude Sonnet 4.5, Gemini Pro and DeepSeek V3. I gave each one the same twenty refund scenarios—ten straightforward ("item arrived damaged, full refund issued"), ten complicated ("customer claims the machine was faulty, but our technician tested it and it works fine")—and asked for emails in German, French and Dutch. Then I sent five of the AI-written emails to actual customers and tracked the replies.
The prompt I used for all three models
I kept it simple. I didn't want to write a different prompt for each model and then claim the results were comparable. Here's what I used:
Write a refund confirmation email in [German/French/Dutch] for a customer returning a [product]. The refund amount is €[amount]. The reason for return: [reason]. SEPA transfer will arrive in 5–7 business days. Tone: apologetic but professional, not overly formal. Keep it under 120 words. Include a line thanking them for their patience.
I added the order number, customer's first name, and any extra detail—whether we'd tested the returned item, if we were waiving the restocking fee, that sort of thing. Each model got identical context.
Claude Sonnet 4.5 nailed tone in all three languages but cost the most
Claude's emails sounded like they came from a person. The German ones used "Es tut uns sehr leid" instead of the stiff "Wir bedauern," which is what Google Translate always gives you. The French emails had "Nous comprenons votre déception" when the customer was upset, not just "Nous sommes désolés." The Dutch emails felt warm without being overfamiliar—"Bedankt voor uw geduld" at the end, not "Hartelijk dank," which one of my Dutch friends said would sound weird in a refund email.
I sent five Claude-written emails to real customers: two in German, two in French, one in Dutch. Four replied to confirm they'd received the refund. One French customer replied "Merci pour votre réactivité"—thanks for being responsive—which is the best outcome you can hope for when you've just refunded €240 for a broken milk frother.
The cost: Claude charged me about €0.09 per email. For eighty emails a month, that's €7.20. Cheaper than a freelancer, but the most expensive of the three models I tested.
Gemini Pro was faster and cheaper but sometimes too formal
Gemini Pro wrote grammatically perfect emails in all three languages. No errors, no mistranslations, nothing that would make a native speaker wince. But the tone was a half-step too formal, especially in French. One email opened with "Nous accusons réception de votre demande de remboursement"—we acknowledge receipt of your refund request—which is technically correct but sounds like a tax office.
The German emails were fine. Gemini handled the cases-and-genders minefield better than I expected, and the tone was neutral enough that no one would call it robotic. The Dutch emails were also solid, though one used "U ontvangt uw geld terug binnen 5–7 werkdagen" (you will receive your money back) when "Uw terugbetaling is onderweg" (your refund is on its way) would've felt friendlier.
I sent three Gemini emails to customers. All three replied with a short "Dank u" or "Merci" or "Danke"—polite, but no one said the email made them feel heard. One German customer asked a follow-up question about the return label, which suggests the email didn't fully reassure them.
Cost: €0.04 per email. For eighty emails, €3.20 a month. Fast, cheap, serviceable. If you're sending hundreds of emails and can't afford to pay for Claude, Gemini Pro won't embarrass you.
DeepSeek V3 was the cheapest but struggled with tone in French
DeepSeek's German emails were surprisingly good. The phrasing was natural, the tone was apologetic without grovelling, and the SEPA explanation was clear. I sent two DeepSeek German emails to customers and both replied positively—one even said "Vielen Dank für die schnelle Bearbeitung" (thanks for the quick processing).
The Dutch emails were fine. Not as warm as Claude's, but they didn't sound like a bot either. The French emails, though, had a problem: DeepSeek kept defaulting to overly casual phrasing that didn't match the situation. One refund email for a €320 espresso machine ended with "Bonne journée !"—have a nice day!—which is fine in a shipping confirmation but feels tone-deaf when you're apologising for a faulty product.
I tested one DeepSeek French email with a customer who'd returned a stand mixer because the motor died after three uses. She replied asking if I'd actually read her original complaint, because the email "didn't acknowledge the problem." That's a failure. If the customer thinks you're not listening, the refund doesn't fix the relationship.
Cost: €0.015 per email. For eighty emails, €1.20 a month. Cheapest option by far, and good enough for German and Dutch if you're on a tight budget. I wouldn't use it for French without editing the output first.
What I'd do differently: split by language and emotion
If I were starting over, I'd route the emails by language and complexity instead of using one model for everything. German and Dutch refunds—especially the straightforward ones—go to DeepSeek V3. French refunds and anything emotionally complicated (customer is angry, product failed twice, we're refusing a refund because they damaged it themselves) go to Claude Sonnet 4.5.
Kryotta's Compare feature would've saved me time here. I could paste the customer's original email and my refund notes, run Claude and DeepSeek side by side, and pick the better response in ten seconds. I didn't think to do that until I was forty emails into the test and realised I was second-guessing every DeepSeek French output.
One more thing: GDPR matters in these emails. I made sure every prompt included "do not invent details about the refund process or timeline." AI models sometimes hallucinate specifics—dates, policy clauses, reasons for delay—and if you send a customer an email claiming their refund will arrive "within three business days" when SEPA actually takes seven, you've created a compliance problem and a trust problem. Claude and Gemini stuck to the facts I gave them. DeepSeek once added "conformément à notre politique de retour" (in accordance with our return policy) when I hadn't mentioned a policy, which is harmless but sloppy.
The cost comparison: AI vs hiring someone trilingual
Hiring a part-time customer support assistant fluent in German, French and Dutch would cost me at least €15 per hour in Western Europe, probably more in the Netherlands or France. If they spend two hours a week writing and sending eighty refund emails—drafting, translating, personalising—that's €120 a month.
Using Claude Sonnet 4.5 for all eighty emails costs €7.20 a month. Even if I spent an extra hour a week reviewing the AI output and tweaking tone, I'm still paying myself instead of someone else, and I'm learning which prompts work.
The trade-off: a human trilingual support person will catch edge cases the AI misses, handle phone calls, and write emails that feel warmer than even Claude's best output. But if you're a solo founder doing €25K a month in revenue and you don't have €120 to spare, AI gets you 90% of the way there for 6% of the cost.
Questions people ask
Can AI write customer support emails that pass for human in multiple languages?
Yes, if you use Claude Sonnet 4.5 or Gemini Pro and give them clear context. DeepSeek V3 is good for German and Dutch but needs editing in French. None of them will match a native speaker's instinct for tone, but they're close enough that customers reply politely instead of asking if you're a bot.
How much does it cost to use AI for multilingual refund emails?
Claude Sonnet 4.5 costs about €0.09 per email, Gemini Pro €0.04, DeepSeek V3 €0.015. For eighty emails a month, that's €7.20, €3.20 or €1.20 respectively—compared to €120+ for a trilingual freelancer.
Do I need to check every AI-written email before sending it?
For the first twenty, yes. After that you'll know which model handles which language well, and you can skim instead of editing. I still read every French email before it goes out, because that's where tone mistakes cost me customer trust.
Is this GDPR-compliant?
As long as you don't paste sensitive customer data into the prompt—use "the customer" instead of their full name and address, reference the order number but not payment details—and you don't let the AI invent refund timelines or policy clauses. The models I tested stuck to the facts I gave them, but always review the output before you hit send.
I'm still using Claude for most of my refund emails, with DeepSeek handling the simple German ones to keep costs down. If you're running a D2C store across multiple European markets and you're tired of Google Translate making you sound like a parking fine, try Kryotta's Compare feature—paste your refund scenario, see Claude and DeepSeek side by side, pick the one that sounds human, send it. Takes thirty seconds, costs a few cents, and your French customers stop asking if you're a bot.
