First, you need to obtain a cdkey for WoW And WoW: Burning Crusade.
You need to create a new WoW account using the first and last name from your scammed account.
Once you have the new account created, you have to do a payed character transfer to transfer the character from the scammed account to your new account.
Once you do that, all you have to do is get the scammed account permabanned by going to a main city and spamming racial comments/comments about dead babies.