The only way to find out and the only way to fix the issue is to contact Apple iTunes support. See the following from If you see a message that says 'Your account has been disabled in the App Store and iTunes' - Apple Support
clicking on "contact Apple Support" below should connect you; if not, there is a contact support link at the top right of this page.
If you see a message that says "Your account has been disabled in the App Store and iTunes," there might be a problemwith the payment method that you have on file.
When you see the message, don't try to edit any of your account information. Instead, contact Apple Support for help.