How do I unblock my iTunes account?

If your account has been disabled in the App Store and iTunes, it isn’t something that you can fix yourself. You will need to contact Apple Support. The following Apple article includes a link that you can use to contact Apple Support: If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support

This is primarily a user-to-user support forum; other Apple users like you.

If it is locked, see: If your Apple ID is locked or disabled - Apple Support