Airtel — postpaid number cancellation of airtel number

Address:

Hyderabad, Andhra Pradesh

I am receiving calls from airtel to pay the bills for a number which i am not using from day one, i requested a prepaid sim but don't know how they gave me a postpaid and now asking to pay bill, every month i ask them to cancel it but they do not cancel it. I recently moved to hyderabad and in our company there were stall of airtel and i asked them for a airtel prepaid sim, they gave me a sim and activated it but i lost it on the same day after a month i received call to pay bill then only i come to know its a postpaid number.