Consumer Redressal

I have been a customer of Airtel Broadband Service since 2008. Since September 2012 there had been regular problems with my broadband connection and Since November 2012 it was almost non-existent. There have been umpteen nos. of complaints over telephone and on their website and on most occasions the calls were closed without even attending. However, after many experimental attempts it was restored on 9th Feb 2013. In between I had asked them to revert all the bills that were raised during the period the connection was down but they paid no attention to my requests and disconnected my connection and now threatening me with their frequent calls seeking payment. I am a senior manager in an autonomous organisation under the ministry of Telecom. Please suggest or intervene to resolve.