Airtel Post Paid Bill
Airtel is using an integrated software to repeat those calls are not made

Airtel is using an integrated software to repeat same mobile number automaticaly in an interval to rise the phone bills. If you check your calls then you will realise those calls are not made. One day I had noticed this and checked all my previous bills realising that they had been doing this trick for a long time. The authorities hesitated to pay back the excess collected.