Q: My iPad won't let me take off a credit card.

A Couple of months ago I put a at&t rewards card on my payment info. I think a month ago or two it said I needed to change the credit card, because something was going wrong with it. I triced to take it off but there's no option too. I don't have a mother credit card to put on I just want that off, so I can update my apps.   I have a iPad mini by the way.