We recommend you to contact the customer support of Facebook to recover the Facebook account, as this is the most efficiency way.
Alternatively, if you have another login method linked to your game account, you can login to your game account to unlink Facebook via the in-game settings, However, if you do not have access to your game account, you should contact the in-game customer service for further assistance to recover your game account.
You may submit an account recovery request through in-game at the login page of the game by selecting Help > Login Issue > Account Recovery > Submit Claim.