Yeah, I am no journalist, but thank for the editing.
If you really want to punish them for cheating you should report that conversation to Facebook. Huge TOU violation right there, their FB profile will be suspended permanently. Even vaguely threatening remarks, especially those threatening to hack your account, are cause for a permanent ban from Facebook. They'll just open a new account, but they'll have to start over in Galaxy Life.
Actually it can be apologise or apologize. My iOS corrects apologize to be apologise anyway, it just depends on your country and the generics of how they spell it.