Vodafone India — postpaid to prepaid conversion

Address:

Pune, Maharashtra, 411001

Hi,
I have been going to Vodafone store in Kalyaninagar, Pune since last 5-6 months to convert my Vodafone postpaid connection to Prepaid, however every time they have some excuse and ask to come again.
Finally when I gave them all what they needed, now since last 4-5 visits they tell me that the system of postpaid to prepaid system is down.
Once they told me that there is no power in the store and their back-up is also over.

Please help, as I am being charged monthly rental since last 5-6 months unnecessarily.