Vodafone India — conversion of postpaid connection to prepaid

Address:

416302

Respected sir/madam
My vodafone no is [protected]
Previously i had prepaid connection.
My sim was physically damaged so go to the vodafone mini store to get new sim with same number. But my sim was register on that person who is not alive.
I want same no so your retailer convert my sim to postpaid connection without my knowlege that sim connection transfer to postpaid connection
I want convert postpaid connection of [protected] to prepaid connection