You can unlink your current Facebook account from your profile in the ingame settings.
In order to do that, please click on "Log out"
After that, in order to link the correct Facebook account to your game profile, please open the Facebook app on your device and make sure you are logged into the correct account.
The next step is to re-link your game to your Facebook account, which can be done via ingame settings as well.
If anything goes wrong, you can always contact us via support.
Please make sure to add as much information about your incident as possible, this will help us to resolve any issues as quickly as possible.