In my experience 99% of people who get banned from something or other have done something to deserve it, and 99% of those will deny it :P If you really think there is a problem maybe try contacting their customer support or something?
Sadly enough this just isn't the way it really is, I also got the Banned from Caht thing on this game but here's the funny part: I can still talk to everyone. it doesn't do anything, it just keeps popping up, I don't even use a Mic so I know that I didn't do anything. People just get Enraged when i go 45-0 on big team and have all thier friends report me. it's happened before too. I find that 99% of the time the person has probably done nothing but be better at the game.
I called somebody the n word and said I wished he died in 9/11, and I haven't been banned. Odd system they have.
By the Nine, did that really just happen? http://us.battle.net/wow/en/character/stormrage/Baalthezar/advanced