Airtel — request for postpaid to prepaid conversion is not working in airtel

Address:

Kolkata, West Bengal

I want my postpaid connection to be converted into prepaid one.
I visited airtel store (Infinity think tank branch, salt lake, sector 5, near sdf more, kolkata) on 8th and 9th sept, 2017. But on both day, service person of that branch told me that, the application/system/server for postpaid to prepaid is not working for the whole pan india and he won't be able to proceed with the request.

My bill cycle will end on 10/10/2017. I don't want to pay any further bill amount. But due to airtel system problem, i will be forced to pay bill till the day its not getting processed.