Airtel — no incoming calls and not able to receive messages

Address:

Mumbai City, Maharashtra, 400042

I use airtel sim for a very long time but from some months airtel giving some network issue and i have compliant about my problem but they didn't resolve my network issue problem after some day i wasn't able to receive any incoming calls or messages from others and when i call to some person then sometime it's show no service on my phone i have tried lots of time complaint but non of airtel customer care executive were able to solve my problem