Account deactivated for multiple account violation- but we don’t have another account

Hi everyone,
So, we’re a corporate entity that was selling our own OEM product on Amazon. We’re a pretty small company, and for sure with 100% certainty nobody in our company has made another Amazon account or anything.

Our seller account was deactivated, here’s the message from Amazon:
“We found that your current selling account is related to a different selling account named [redacted] and created in [redacted] that violated our Multiple Account policy (https://sellercentral.amazon.com/gp/help/1801) and was therefore deactivated. As a result, you may no longer use the current selling account to sell on Amazon”

We’ve gone back and forth with the support team, we’ve submitted our corporate documents, Tax documents, all kinds of stuff to prove our identity, but Amazon keeps denying us and sending us the SAME MESSAGE about the multiple account policy.

It’s plenty easy to prove our own identity, but how are we supposed to prove a negative, that we don’t have an association with another account? They won’t even tell us any information about the other seller, no phone number, address, email, nothing. They’ve said we have to contact the other seller and get them to reactivate their account, but we literally don’t know who the other seller is, and we still don’t know how or why Amazon believes that is our account.

Has anyone dealt with a similar issue? How did you get it resolved?