[Resolved]  Airtel Kerala — Disconnection of mobile number

I am Sanjeev Nair, NRI from Abu dhabi. I have taken a pre-paid mobile phone connection from Airtel from a shop in Mallapally in Pathanamthitta Dist, Kerala in July 2009. I have paid Rs. 2500/- for my fancy number [protected] as demanded by the shop owner. He told me that this is a life time SIM and I have paid upto April, 2012. The message from Airtel also confirmed the validity of the SIM. When I left India, I had a balance of more than 2000 rupees and after coming to Abu Dhabi, I use to get messages from Airtel. Few days back, this SIM got disconnected, and i contacted my cousin to find out the reason. He says, there are some conditions for this connections, which was not told to me or informed me either by SMS or by any other means, in which if this connection is not active for more than 3 months, it will be disconnected by default. This is a total injustice to me as an NRI, who use to visit his home once in a year and spend lot of money on my mobile. How can
Airtel disconnect my SIM which had an expiry upto 2012 and have balance of 1160 rupees, without informing me by SMS or Mail or Call ? I want to continue with my airtel with my same number, if they allow me to do so or get back the my money and take a new connection. Will you please consider my request?