This is unlikely to work if the account has a clean record, but I think it's worth giving a shot
How to get banned/permabanned fast
Some of you might ask, why the hell would I wanna get permabanned?
Some scams want you to get the scammed account banned in the end, and this is just a good way to try doing it.
It's quite simple:
1) *OPTIONAL* Message some random low level noob and say this:
"Hello. I am a gamemaster of World of Warcraft, and I have reasons to believe you scammed another player. I need you to give me 500g right now, or you will get banned"
2) Ignore the noob, you don't need him anymore
3) Open a GM ticket. In it say:
"A player is refusing to honor an agreement I had with him. We agreed that he would give me 500g, and now he is refusing to do so."
4) After a GM whispers you let him do his RP crap, he might ask for the name of the noob, it doesn't matter. As soon as he's done with his little welcome-monologue wait 3 seconds and whisper him this (have it ready, macro'd/ctr+c):
"Hello, I am a gamemaster of World of Warcraft. It has been reported that your account has been compromised. May I have your account name and password so that I know you are the actual owner of the account?"
5) Wait 5 more seconds and go:
"o ur GM too?"
"sry man my bot whispered that"
6) ENJOY YOUR BAN!!!