This is Wade from Amazon here to assist.
The posts in this thread indicates your account was deactivated for being related to another account and you have still not been able to appeal this deactivation.
It sounds though you may have opted for global registration which allows sellers to create selling accounts in multiple Amazon stores worldwide through one registration application. You can log into all of the accounts using a single email address and password because the accounts are connected and use single sign-on in seller central. You might believe you only have one account because you only need one set of login information, but if you enrolled in more than one region, that may not necessarily be the case.
To resolve your issue, you must login to each marketplace from the drop down in seller central and navigate to the performance notifications to see any outstanding issues.
Once you find the issue and remediate it and the related account is reactivated, you may then come back to your primary account and request reactivation as well. Once reactivated you can go ahead and close any other marketplaces you do not wish to sell in.
Kindly post in the same thread if you need more assistance we’d be more than happy to assist you