Rediffmail — Hack of rediffmail

Dear Sir / Madam
I am using rediffmail id for nearly 12 years. i.e. [protected]@rediffmail.com.

Since a day I was trying to log on to my Rediffmail Account but I couldn't. I tried to recover my account, I found that I was unable to access my account. I also found that the, phone number, and email Id have been changed in the recovery option by the hackers. Kindly suggest me or resolve my problem.
Kindly address this problem by responding to this complaint.