Airtel / Broadband — mental harrasement

Hi,

I had requested the cancellation of broadband connection [protected]. After the cancellation confirmation I got several calls from airtel asking whether anyone in my circle was willing to take up my connection.I said a NO to this and requested the airtel executives to cancel my connection.This was 6 months back.3 months after so-called cancellation the airtel people started calling me up for bills.The reason I got the phone disconnected was that I had shifted to some other place where Airtel did not provide its services.I always told the executives that I had cancelled my connection.
Suddenly I got a call from an extremely rude person that the airtel people had sent me a notice on my old address and I must pay my bill by 19th December to avoid coming to the court in Delhi!
I asked him to give me the phone number of the person who was responsible for sending notices.He gave me Keshav Sharma's phone number([protected]) .This person picked up my phone and said 'Keshav here' I tried to talk to him but the moment he heard that I had some query regarding my airtel bill he replied that he was not keshav. I called him up for the second time and the same thing happened.I finally called up the customer care department and they said that in the logs for my connection it has been written that I had requested an ownership change for my connection.This is an absolute lie and nothing less than robbery!!
I have reported the situation to an airtel manager .The complaint number is 27625116.
What should be done now?