My account has disabled thats why i cannot purchase icloud and backup is not possible

This is primarily a user-to-user support forum; other Apple users like you. You will need to contact Apple Support. See instructions in: If you see a message that says 'Your account has been disabled in the App Store and iTunes' - Apple Support

The only way to resolve that issue is to contact Apple Support as described above. If you did that and still have the issue, you will need to contact them again.