Okay, then you will have to choose the option to let you dispute the claim through CS, this is also found in the "Forgot Password" menu.

he change everything, so i can't reset password

Hello, if you have not done so already, the account recovery process can be found by clicking the "Forgot Password" option upon login. If you do not have any security methods selected, you can create a ticket to get your account back.

If you have set up the 2 step verification and it has phone number. The person can't change nothing without the code that gets sent to that number.

Stolen, or perhaps you shared account info to someone to do dailys/log ins and that person was untrusty. However you can go to Customer Service and try to change password or restore it with mail/phone. Maybe you are lucky and the person who took it hasn't changed everything.