Airtel — re-issue the same number

Address:

Ghaziabad, Uttar Pradesh, 201010

I am using the airtel number last 2 year continually even 1st time went to airtel store nearest me that was a mini store but there was no any kind who talk like sensually this was not main problem the problem is that i have lost my phone so i want to re-issue the same no that was a prepaid no but they said i can give you only postpaid no i went there 3 or 4 time but they said the same i cant understand that what is the problem to give me prepaid that was i using continuously.