If your payment was automatically cancelled, here are some suggestions that will hopefully help you successfully place a new order.
You can contact your bank to make sure that they allow international transactions. You can also try to place the order using a different payment method, a different browser (in our experience, Google Chrome works best) or you can try again from a different computer/IP address.
Unfortunately, it is not possible to change a payment method after completing the order. If the order is not completed with a payment, it will automatically be canceled. You would then have to place a new order.