As my account is suspended ,I am not able to login to cPanel and therefore I cant manage my addon domains.
If my account can not be unsuspended then I want to release my addon domains.
Your account can not be unsuspended. It's a zero tolerance suspension. What you can do is request for your account to be deleted, so that it's deleted faster. Here's how to do it http://kb.x10hosting.com/questions.php?questionid=50