Airtel — 4g internet speed extremely slow and pathetic

Address:	Jaipur, Rajasthan, 302019
Website:	www.airtel.in

I have airtel rs. 448 prepaid plan, 4g sim card and a 4g phone (Oneplus 5). I have enabled 4g and even volte in my sim settings. However, i don't get 4g at my home.
4g speed is extremely slow (50-60 kbps) and the network frequently drops to 3g/h+. Especially it drops to 3g when on a call.
I get 4g speed in other places even 15-20 feet away from my home, but at my home the speed is extremely terrible. Resolve this as soon as possible.