Hotmail Account Problem

I have got a serious problem of Hacking my mail from some unknown who have the access to my emails and authority to send all my contacts mails without my knowledge. I have changed my password also, but the problem remain same. Today morning he sends numerous mails after changing the password on yesterday. 

I have check my security settings and found that in Security info category one email ID - *** Email address is removed for privacy *** has been registered which is not belongs to me. I have 1 phone number and 2 mail ID registered earlier. Probably this email id has been added by the trespassers. I am able to delete my number and 2 Nos. email id only, recently added that suspicious mail id doesn't show in the deleted list. Further my email has been automatically forwarded to some unknown ID also which is very much similar to my own ID. I have cancel the forward option. 

I am in a serious problem and need your support on urgent basis. He has send such mails to my contacts, that affects both my personal and professional life.

Please check the details and inform me the remedy to sort out this issue asap.

With Regards

Dr. S.K Singh