why has my account been disabled

Perhaps this article will help:

If you see a message that says 'Your account has been disabled in the App Store and iTunes' - Apple Support

or

If your Apple ID is locked or disabled - Apple Support

The most common reason an account has been disabled in the App Store and iTunes is you've entered the wrong password multiple times. Apple gives you a finite number of chances to enter the correct password before locking you out

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