paiement
I changed my credit card and cannot modify the paiement account in the user information in IOS
iPhone 5s, iOS 9.0.2, credit card not changed
Hello
I would recommend 1 of the following 3
Use a different CC
Use an iTunes GC
Chose None as the payment option.
You could contact Apple support but most of the time this is something on the CC side and Apple wouldn't be able to see why.
Contact Apple for help with Apple ID account security
https://support.apple.com/en-us/HT204169
Best of Luck