Please help me, there is a problem with my account.

My account is registered to a non-existent email domain @xmal.ru and is linked to my main Steam account, because of this I can't play EA games, I wrote to support, she didn't help me, I didn't give her enough information, and I was on the account once when I registered, I don't even remember how I did it, although I don't drink, I hope this can be solved somehow, I just need to unlink the Steam account please help