Airtel — wrong rate charged for international calling

Address:	Hyderabad, Andhra Pradesh, 500084
Website:	www.airtel.in

I have made an international call to australia and airtel has charged a whopping rs 180 per minute and the actual rate was rs13 per minute. My bill came to rs4220, i have repeatedly called them for 10days and they have promised many times that the bill be be corrected but they didn't do anything and finally charged my bank account with the ecs payment of rs 4220, i lost trust with this operator, every person i talk to tells a cooked up story and no clear action taken