Why my account disabled in the App Store iTunes

There could be billing issues on the App Store or security issues.

Call a genius (Apple Tech Support) Tell them that your account on App store / iTunes is disabled

AFAIK, The tech support will verify your Apple ID credentials on their end (with the proprietary tool - iCloud Support App tool to verify your ID and see if your ID on App store is disabled) Then they will transfer you to a department (Media Service MSS) - An advisor from MSS department will then handle your case and enable your ID on App Store

Cheers!!