App Store

If your Apple ID is locked or disabled -

https://support.apple.com/en-us/HT204106

ASC - Late 2012 Mac mini, macOS 10.15.1; Watch, series 5 GPS/cellular, watchOS 6.1; iPad Air 2, ipadOS 13.2; iPhone 8+, iOS 13.2; TV 4th Gen, tvOS 12.4.1;  HomePods, audioOS 13.2.1 and Airport Express w/ Airplay 2

 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.  

iTunes Support

iTunes Support – world wide