Vodafone India — Not at all converting my postpaid sim to prepaid

Address:	400614
Website:	Vodaphone.in

I m using postpaid sim but i want to convert it to prepaid i applied on 04 - july for the same stil nothing happen i made an advanced payment of 7 days so it can converted to prepaid but its been not 18 days no response from nodal officer as wel not evn from vodaphone gallery where i applied. Vodaphone worst service its like they force people to use postpaid and pay