Why my account has been disabled?

See these circumstances:

1) Apple ID disabled (generic) = If your Apple ID is locked or disabled - Apple Support

2) Apple ID disabled (in iTunes & App Store) = Contact Apple Support, after reading the steps provided in this support article:--> If you see a message that says 'Your account has been disabled in the App Store and iTunes' , and using the following specific link:--> Apple Support

If you get no help, contact Apple Support using this link:--> Contact Apple for help with Apple ID account security - Apple Support

Regards

Giulio