Airtel — network and data usage - horrible commitments from airtel to clients

Address:

401107

I have ported my number from vodafone to airtel on 5th may.
I was promissed for the best network and data usage by the company.
However ever since i have ported i am getting horrible network and data connectivity at my home (Poonam sagar complex, mira road).
I have already complaint the customer care twice but no improvement from their side.
Also i am stuck as i cannot re-port my number back to vodafone at-least for 3 months.
I am really irritated with the way the things are being handled by the customer care.
They have sent me a bill for the first month.
I do not wish to pay the same and also for the coming 2 months unless these people do something about it.