Airtel — all lines are currently busy whenever i try to call on any non airtel std/local number

Address:	Ranga Reddy, Andhra Pradesh, 500084
Website:	www.airtel.in

Hi,
I am facing this issue since a month now. Whenever i try to call on any non airtel number i hear the message "all lines are currently busy". For a successful call it takes more than 20 attempts, sometimes, it even crosses 100. Airtel is clearly looting us. I believe they share a single line with multiple customer (May be with 50 customers). Please have it checked and try to resolve the issue. It just pathetic service from airtel. If somebody wants to make an emergency call, how he/she is supposed to do it.