Rediff.com India — hacked account retrieval

Sir/madam, my name is jacob joseph. J and i have been using [protected]@. Rediffmail for last 7years. My alternative email address is [protected]@gmail.com and my mobile number is [protected]. Before 3days, i was unable to open my rediffmail account because my password is not getting accepted and alternative email and mobile number were also got changed somehow. Please help me to retrieve my account because i have some personal and some important office mails were also in it. I kindly request you to reply me to [protected]@gmail.com. Thank you.