Hello, I would suggest to you, to change your password, security question, and make sure the e-mail on your account is actually your e-mail, then if possible, change your e-mails password as well.
That's some tips on how to keep your account secure after being infiltrated by a hacker.
Thanks!
~RedEyes.
(If your account is banned in-game, please let me know, and I will check into that. This is not a bug, so I will move it to the off-topic section.)