[Resolved]  Airtel — SIM card closed

Sir, My I'm using my Airtel prepaid SIM for last two and a half year. The number of my SIM is [protected] . Till yesterday, it was working. Suddenly today I saw that it seems 'Registration Failed'. How could it be sir. I called customer care and they told they have not recieved my documends, even 2 and a half year passed. I am shocked. How could they do that. I am facing very much problem. Sir please active my SIM as soon as possible.
Thank You
Susamay Ghosh
[protected]@gmail.com