Airtel — poor voice quality and frequent call drops

Address:

Hs No. 21, Ground Floor, Balaji Garden Layout, Gottigere,, Off Bannerghatta Road, Bangalore -560083, Landmark Opp. Nandi Retreat Apartment, 560083

Hi,
From past 2 weeks I am facing frequent call drops and pathetic voice call quality. I stay in Gottigere, Bannerghatta Road, Bangalore 560083

I called help desk to report this and they were very arrogant in their response saying why are you not changing your sim to 3G/4G. I asked them whether they notified user about this and they said now we are informing..if you change or not, thats your choice, but if you don't change you will have poor quality service. IS THIS THE WAY AIRTEL TREAT ITS CUSTOMER??
They claim to provide network in Himalaya but can't provide proper service in city.