Why was my payment rejected? What do I need to do about it?
If you pay by credit card, a rejected payment usually means that either your credit card is no longer valid (i.e., you've cancelled it, it has been reissued under another number, or it has expired), or it has reached its limit. Remember that if your credit card number changes, your credit card issuer will not necessarily update that information in our records. To ensure that the information is up to date, you should update your credit card information whenever it changes (which you can do at My Account).
If you pay by automatic bank deduction, a rejected payment usually means that you've either closed your account or that the account has insufficient funds.