Airtel — Poor Network & Internet strength since last 3 years @Pimpri Pune

Address: A4/7, Shraddha Heritage, Behind City One mall, old Pune -Mumbai highway, Pimpri, Pune -411018

Since last 2.5-3 years we are consistently facing signal strength & network issue wit Airtel Network at our Locations in Pimpri, Pune, Maharashtra.
There are issues like calls not connecting, distracted voice, poor strength, call drop in-between ongoing calls, low or no internet strength. All these issues were not earlier on same location. In a city like Pune-Pimpri we can't expect such poor connection.

We have addressed this issue to Airtel customer care, twitter handle many times but there is no technical person visit happened till now. There is no proper Grievance portal available to raise issue in a channel. (Attached are screenshots for your reference) also attached position of signal strength at my home.

Since last 3 years we are wasting money by recharging 2 mobile phones and quality is poor.

Our request is to
1. Improve strength of signals in our area as per address mentioned below
2. Can we claim refund of money that we paid in last 3 years for 2 mobile phones