Airtel — I am complaining about slow internet speed

Address:

New Delhi, Delhi, 110094

I, kapil, am a customer of airtel prepaid for the last 5 years but not now i have been facing slow internet speed since last 10 days. I have complained so many time but nobody is giving me precise reason behind the problem. The sim's network automatically changes from 4g to 3g despite i have selected only 4g (Lte) network. So, kindly please resolve my grievance as soon as soon.