apple id

If it just says its disabled see here: If your Apple ID is locked or disabled - Apple Support

If it says its disabled for iTunes & App Stores specifically: If you see a message that says 'Your account has been disabled in the App Store and iTunes' - Apple Support

 Apple ID disabled - Your account has been disabled in the App Store and iTunes

Contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.  You may need to pick a problem that is slightly different than yours to get a chat option.  

iTunes Support

iTunes Support – world wide

If resetting the password for it did not work, or the message specifically states the Apple ID is disabled in App Store & iTunes, then you will need to contact iTunes Support as described in the links above.