Airtel — not converting my postpaid number to prepaid

Address: Indore, Madhya Pradesh, 452001

I'm using airtel postpaid number [protected]. I want to convert it to prepaid. I have visited airtel office several times. But they always ask to come after some days.

Its over a month i'm trying to convert my postpaid to prepaid but still no converted yet. I also written emails to [protected]@in. Airtel.com but i didn't get any response yet.

I'm not sure what i should do now.