Rediffmail — Rediffmail Account got hacked

Hello Team,

I am having my email account wit rediffmail.com for many years and on 4th August someone has hacked my account. my email id is [protected]@rediffmail.com. hacker has changed the password, recovery email id as well as mobile number for this account.
Using my email id he has hacked my linkedin profile as well and sending invite and messages to many people.

Could you please help to resolve this.