How do you to recover an account on World of Warcraft

If your account was banned by Blizzard, it cannot be recovered and is gone forever. If you stopped paying the subscription, all you have to do is log in to battle.net and reactivate the subscription for the game to work.

If your account was locked because it was compromised ("Hacked"), you have to contact customer support to have it restored. This will require sending them a copy of your ID to prove you are the owner, as well as filling in a form stating that you fixed whatever error or Trojan you had that caused the compromising of the account.