I don't know what to do
You should have all the necessary information to claim your ownership. But if you are in doubt, you should open a ticket and ask via support. That way you can claim ownership NOW and nobody else will ever be able to do it.
At the same time, if the hacker had been doing some botting, you might prevent a ban that way.
Ask about what you can do about increasing your security too. As it involves the steps you have already taken, this answers might be scaled to your personal needs.
Community Coordinator
Hello Searix,
what Michael has said is correct. You need to contact Customer Support, here, in order to set up the matter. If you think you may want a rollback of your account, you can also ask for it there.
Thanks.