The random person can't access the account, the link is only to lock the account. I didn't buy this account. I sent a signed message which was posted over 1 year ago I think.
The account is not banned it's locked. It was my fault though for using open access email. Simple mistake turns out to be a huge headache.
You can wait for a very long time if you're waiting for Admins, they barely recover accounts.
However, since it's not hacked, you still have access, and it's only locked "for security", you may be in luck: as far as I know, Global Moderator
hilariousandco can unlock those accounts.
My recommendation: sign message to prove ownership, include your current account name, the date, and a link to the staked address, and either post it here, or send it to hilariousandco. This is probably your best option, good luck!