Since a lot of us can't access our account on battle.net and when you want to delete your payment method. it says recurring wow sub won't be cancelled. Does the ban also cancel your subscription or are they that cheap to charge us 6months of game time without us being able to play?
if the payment was less then 5 days ago you can contact whoever you used to process the payment and get a full refund.
Fun fact. I sent a in support ticket about a account that was banned only hours after it hit my CC. I stated that it was highly illegal, and unethical to do this and would be pressing for a charge back. They gave me a 72. I would post but that account is linked to a battle net I am still on.