Airtel — internet connections

Address:

Chennai, Tamil Nadu, 600033

I hold a dongle connection and it's not been working properly (Signal problem) for a long time. Repeated requests to airtel and 198 have yielded negative results. Their answer is always "we are looking into the problem".
No one from the organisation is bothered, right from answering the phone call to giving instructions on how to go about it.

Sometimes it looks as if they are doing us a favour after charging us for every rupee

On top of it, they are sending me the bills...