I have been using my Visa debit Card on the App store since day one of the ipad release. I have used it Via my iMac and via the iPad app store. 6 days ago my card began to be declined by both Apps. I have checked with my bank and the card is fine, I have money in my account, yet whenever I try to purchase an app I am told sorry but your payment method is declined. What can I do about this.