Airtel — regarding airtel network issue

Address:	411007
Website:	www.airtel.in

I'm using airtel from very long time about 7 years now. However i'm facing low/no network issues in pune.
I had registered a complaint for the same but they are not able to solve the issue. I did everything they suggested me to do to get good network and speed but the conditions are still the same (Worst).
Same thing are happening with the people in bangalore.
Maximum time we get a 1 bar out of 4 airtel network. Even if network bars reach to 4, we don't get the 4g speed. Speed is like 2g or 3g.
This is the conditions of all over pune.

I paid more than approx 400/- rs per month as a airtel postpaid bill.

No improvement after lots of complaints.