Like many of you I hack 100% when playing black ops and have been banned from my fav servers to own on, in order to get back in follow these steps;
1, setup a new steam Id
2, go to your local games retailer, buy BO, tell them its for a freinds Bday and if they have it you want to be able to get a refund
3, take the serial code, use it with your new steam Id
4, take the game back, get your cash back, and continue to own on all the servers you were banned from.
You can continue to do this until you run out of stores to return the game to.