Airtel — network and net issue

My net has lot of issues it automatically goes to 2g from 3g
It works in 3g from jus few secs den it goes to 2g
N i have network issues
Call does not get connected sometimes
Idk y airtel network is soo careless😡😡
If v have improved work on internet d signal will go off or net ll go to 2g
N v get annoyed by it
Evn now my net went on 2g
Plzz kindly look into d matter