I used airtel 4G mobile and wifi router since 3 years. I never got speed more than 200kbps. I raised complaints many times in 3 years, I always got reply, tower upgradation going on near you.
Finally, I realized that they are fooling me by saying this no tower maintenance goes for 3+ years.
I closed my connection finally and very happy with my jiofi device.
This is really sad that even after raising concern upto high level no one I saw really responsible. either no one calls you or only reply tower upgradation in progress.
In 3 years, an 11 story building near my house got completed but Airtel tower upgradation never happened. I sent speedtest, fast.com screenshots to customer support showing 90kbps speed in metro city. but no one cares in Airtel