Using Apple Music

Click the "Request reactivation" link in the following support document. Only Apple support directly can tell you why it happened and help you resolve the issue.

click here ➜ If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support

Try to do so from a computer. Its the only way to resolve the issue.

If it still won't work try this form: Media Services - Contact Us - Official Apple Support