How do I update my payment method on file? It won't take my card
I am trying to update my payment method on file because my account has been disabled, but my credit card wasn't accepted either. What do I do?
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First you have to get your account enabled before you can change the payment method.
Contact iTunes Support for assistance. See the Apple Support articles below for contact information.
Apple Support schedule phone call
If necessary, try Twitter
https://twitter.com/AppleSupport. People have posted it may take an hour or more to get a response.