Rediff.com India — email account hacked. please resolve

Hello,

My rediffmail account is hacked and my alternative email id has been changed by the hacker.

My rediff email id is:
[protected]@rediffmail.com

Hacker's email id which shows as alternate email id: [protected]@gmail.com

I tried to remove above hackers email id ([protected]@gmail.com) from the alternate email id, but the changes are not getting saved.

Not only this but through the help of my rediffmail account the hacker accessed my linkedin account. He has changed my profile picture and my name and some other data from linkedin. And now hacker is sending messages in arabic language, to many people asking for their contact numbers indirectly, using my account (Checkout the attached image for reference). People are also responding to it, sharing numbers.

This thing is serious. If possible please remove the alternate email account attached to my account from your end.

Kindly into the matter real urgent.