Hacking an account (Call of Duty: Mobile)

This is the person who hacked the account.



First hacked Facebook. I switched to the game on my account and linked it to the account of the cal of duty.
How can I unlink his account from my aka?
This is my account
He hacked him
I'd: 7011007835610284033
Nick × Graf ×
He changed it, but it was Ivan_Habarov