Payoneer Accout Locked

My Payoneer account has been blocked permanently. when i try to login the message says "Your account has been locked – please contact us to unlock the account". I contacted through payoneer.com/ContactUs.aspx, 4-5 times but there is no response. Is Payoneer fraud/scam? why there is no response. Even a ordinary local service provider responds immediately on any complaint but Payoneer didn't. what a poor service. Is there any solution for it?