Hello @Seller_HDtIUG1JKf6MV and thank you for posting to the seller forums.

Danny here, and I'll respond in both languages in case that is helpful, but please do accept my apologies for any issues with the translation from English!

I am sorry to hear about this return experience, and want to make sure you have the below resources which detail the process for applying a 100% restocking fee for materially different items returned, as well as our SAFE-T Claim policy in case you need to submit a claim for this. Please also use the report a violation pathway to report this customer behavior if you haven't already.

Thanks, and please let me know if you have any questions!

-Danny

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Restocking fee guidelines: https://sellercentral.amazon.com/help/hub/reference/G201725780

SAFE-T Claim help page: https://sellercentral.amazon.com/help/hub/reference/G202175000

Report a violation: https://sellercentral.amazon.com/abuse-submission/form/buyer-abuse-refund