Airtel — about network problem i am facing

I am the user of airtel service i was very satisfied about the network speed before lockdown but after lockdown my network speed is very low and most of the time switches to 2g from 4g i am facing very much problem in my studies so please help me because o[censored] i cant attend my online exam so please fix these problem thanks for listening to me and i hope u will solve my problem as soon as possible and i am living near a airtel network tower but i cant get 4g network what should i do now thanks once again