Rediff Mail — My e.mail add [protected]@rediffmail.com has been hijacked

Sir, I have an e-mail id [protected]@rediffmail.com for many years, and lately I found I could not open my account, as the password has been chnged. The alternate e-mail. address is [protected]@yahoo.com which is not mine .I have complained before and nothing has been dione so far. I would like this problem to be sorted out, and I get my e-mail id back. My other e-mail id is [protected]@gmail.com Thanx.