unlink FB account

I've been playing asphalt 8 on window 10 with my xbox account connected. My friend accidently signed into his fb acc in game while i still have mine xbox acc connecting, and now his fb acc is linked to my xbox acc and have all my gaming process. Is there anyway i can unlink his fb account?

[RLR]

Contact CC via ingame options.

I have the same issue, could you please help me? I want to unlink mi fb account from a Game Center’s account that is not mine and then link my fb account to my Game Center’s account. Please help