I really don't believe you got banned for nothing. You had something running to get banned for just PM.. I've been pm'ing every GM that's online from all my chars and not one ban for me, yet I've got many many many koxpers banned of yet.
By the way they can also see if you run a bot on another char, log out, close bot, log new char, pm GM. Still gonna get ban.[/b]
How exactly do you think they can do that?