If you still have access and have a phone number linked to your PUBG MOBILE account, please enable secondary verification through your Account settings of the game. After enabling secondary verification, log out of your PUBG MOBILE account from all devices one time, the unauthorized user should not be able to access your account.
For further assistance regarding hacked or compromised accounts, please reach out to the customer service of your linked social media account and the in-game customer service, @οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½.