same thing happened to me also...called customer service and they are going to credit my paypal the 20 dollars back once its processed. So give them a call they should be able to straighten it out.
On a side not got a call from reebok.com today and they left a voicemail telling me they had the og's back in stock and to give them a call if I still wanted them. I tried to order them on the 18 and didn't make it through the checkout process before they were gone, they must have looged my information. I got to give reebok credit for the customer service nike should take note, seems like they were holding a pair for me if i still wanted them, to bad i'm waiting on my pair from citygear.com thats taking forever so i wont be returning the call.