Airtel — signal stop working suddenly

Respected sir,
My sim stop working suddenly while using mobile. I have reinserted sim several times and tried to insert sim in other mobile but showing no signal. I thought it's network issue in the area so i spoke to my neighbour about the network problem but he told he is recieving full network. I'm not able to communicate with airtel customer care on 121 or 111 both number are showing wrong. I have raised a mail on mail id [protected]@ng. Airtel.com but i didn't get any solution about signal problem on my sim card.
In digital india we have every task link with mobile number. I'm job less without my mobile number.
So it's my humble request to resolve my issue as soon as possible.

Regards
Ajay singh