Airtel — airtel network network connection issue at home

Address:

North West Delhi, Delhi, 110018

I'm using airtel postpaid simcard from years but now i'm not getting the signal inside my home so please do clear my issue as became a big issue to
Get calls and to somebody, so please try resolve this issue. Airtel's network quality has been degraded alot, facing difficultly to connect at many places.
Address ground floor 211, pocket 4, sector 2, rohini, delhi.