Please help!! Account Deactivation due to "other account" - how can I prove this through an appeal when there is no other account

Hello,

I am sole FBA seller from the UK. Recently, my account has been deactivated with this message:

You have a separate account which was enforced for violating one of our policies. As a result, you may no longer use "my brand" Selling account to sell on Amazon.co.uk.

Update: I already submitted an appeal stating that I do not own any other account, and Amazon said I do not have enough information to reactivate your account at this time.

Is there a way to go about this? I have read about many deactivation issues, but I can't find anything similar to my case. Amazon doesn't have any details regarding this "other" account, so I am not sure what appeal, reference or additional documents I can provide to substantiate my request.

Your insight/experience would really help.