Same happened to me. Said "Your account has been closed due to unpaid fees resulting from declined authorization on your credit card. You can reactivate your account by paying these fees with a valid card. Pay fees now? (LM-21)"
What unpaid fees? >=O
This is very annoying. My other char got charged for the expansion i bought 2 days ago (it was expected) and it is still fine. There is balance available (Plenty i might add) on the Debit Card.