Vodafone India — changing the ownership of sim card

Address:

411039

I have been using the vodafone sim card from 8 years. Due to new rule to update aadhar card detail i came to know that the card is registered on my friends name. I requested them to change the ownership as i am ready to submit my documents as well as my friends noc but they refused to do it. They said you have to convert it into postpaid only then it is possible. My mobile no is [protected].