Airtel — bad internet speed

My internet is not working well from last 2 weeks. Speed is so poor like 2g speed. And downloading speed is very very poor. I am using 4G smartphone and recharged net pack of 448 of 2gb per day limit.
I am able to use u tube, fb etc etc properly. Internet is 4g but it gives 2g speed only. I also complained to customer care about this. But no action taken yet.

Name- pawan from harkesh nagar okhla metro station.