I tried cheating during campaign too - they banned me.
I tried contacting their support and they said that they won't unban my account.
When I told them that they are propagating piracy this way - they answered that it does not matter to them and the only thing that matters is that they can ban whoever is cheating.
Also they proposed me to buy another copy of the game.
This is their way of business - stupid one I think.
[Edited by SharpSteel, 1/23/2013 3:21:56 AM]
I seriously doubt a Blizz employ turned round and replied in that manner.
You have all been warned in the past, playing while connected to Blizz servers will get you banned, but people still do it. And here is the result.
Ok most people will cry because they can't cheat, but it is their system and you all agreed to their TOS when installing and subsequent patches installed.