problem with display name tagged to my hotmail account

While my name is Simi Malhotra and my email id is *** Email address is removed for privacy ***, when I send a mail, the recipients often see my display name tagged as  'Avtar Singh Malhotra', which is my father's name. Also, when anyone sends me a mail I see the displayed name to which the mail has been sent as 'Avtar Singh Malhotra'. Though in my settings, I have reset my name as Prof Simi Malhotra, the problem continues. I have been a hotmail user for close to 15 years and this is a problem which has started only in the last 3-4 months. Please suggest a solution. Thanks.