@member38259 when you change credit card details you then need to manually purchase your goody bag here http://giffgaff.com/goodybags make sure recur is disabled here firstly http://giffgaff.com/profile/payment-details
Then click the goody bags link click one needed add to your basket then click continue this will give the payment options page click on pay by credit card payment then click confirm my order once that's done goto your dashboard via here http://giffgaff.com/dashboard/
And below goody bag will state why not set your goody bag to recur monthly so you don't need to worry click and follow instructions given to reset recur monthly again
You can check the card details here to check they are correct, My payments
and also on the same page turn off auto recur.
then turn auto recur back on.....
I hope this helps.