Airtel — Can't use mobile internet

I have ported in my number from Jio to Airtel in a hope that Airtel always proudly advertise that they are the biggest network service provider however it's not even a month I am facing a serious network issue specially while using mobile internet service.
I live in a remote city of South Delhi in B.H camp, Govindpuri, Kalkaji and I don't really expect a bad service like this from Airtel.

I have tried with all the basic trouble shooting step and even changed my handset couple of time still the problem remain the same.

Please resolve the issue at the earliest.