HT1918: iTunes Store: Changing your payment informationLearn about iTunes Store: Changing your payment information
Currently Being ModeratedMay 17, 2013 11:11 PM (in response to Wandafromfl)
You might be able to re-enable it via this page : http://appleid.apple.com, then 'reset your password'
If it then works on your computer's iTunes but not your iPad / iPhone / iPod Touch then try logging out of your account on the device by tapping on your id in Settings > Store (Settings > iTunes & App Stores on iOS 6) and then log back in and see if that 'refreshes' the account on it
If that doesn't fix it then you might need to contact iTunes Support : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page