Rediffmail — My Rediffmail Email-id is hacked

For the past 4 to 5 days I am trying to login to my email but it is giving me an error prompt saying wrong username and password combination. I tried to open it by giving FORGOT PASSWORD but there it is showing an email-id a******************[protected]@yahoo.com which is not all my alternate email-id and for your kind information I have never set such an alternate email-id. Please do consider this issue as it is my only official email-id for all my communications. Please do solve this issue at the earliest and do take proper action against the hacker.