Unlink my Kingdom account from a Facebook account I didn't choose to link to
I have a problem with my Kingdom account (the one I have my game progress linked to). This account was accidentally and unexpectedly linked to a Facebook account without any knowledge or involvement from me. Now my profile shows the name and picture of a person that IS NOT me. Even if I changed my name and avatar back to how it previously was, the FB picture and name still appear. How can I unlink a Facebook account from my Kingdom account?