Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Microsoft North American Retail Product Refund Guideline
https://www.microsoft.com/mscorp/productrefund/refund.mspx
NOTE:Print out this page and show it to the store!
This does not solve the problem.
If I get a new box of an English office, come back home and set it up.
Well it'll be in French again since MyAccount is stuck in French and cannot be changed to English.