@jespah,
The company Gumi had you tie your facebook acount to your game account. It will be embedded forever. You can't override, remove, etc. On the iphone app, he rolled a new account and then linked it with a dummy facebook account which he gave to me.
I have heard instances where even if someone goes into your account changes the email address, name, and phone number, you can get it back. Thus allowing me not to be able to log into my game account.
Perhaps adding an authenticater to the account.....