Airtel post paid corporate connection
No network for long time and now harrasment for settlement

I had airtel corporate connection in Pune for more than 1 year, and the network from my home used to vanish for 2-3 weeks at a stretch. When I went to their outlet near my home they use to say server is down n customer care just offered to waive off rent. Once this happened the third time for ever a month, I decided to move to a new connection and asked them to settle my account & include the rental waiver they had promised and the deposit they had taken. Their agent said they shall inform once it is confirmed with billing dept. And raised a complaint for me. They never Got back and are now are harrasing me to pay full amount. Please help and suggest what I can do!

Thanks

shobit