I haven't seen it anywhere so don't flame me if it has already been post....
it is very simple but require a credit card and at least 10$ ...
all you do is get on a WoW selling gold website and buy the cheapest amount of gold you can ( 10$ for like 80-100g --- I don't know the price ) they will ask you to which character you want it send ... you type the name of the Character you want to get banned .... then you log into WoW and make a ticket saying you heared that < Character you want banned > buy golds ... they will go look at the guy account and they will see the ingame mail from the gold vendor and they will permanently ban his account