Airtel — my sim is not showing any network

Address: Nalbari, Assam, 781334

I switched my reliance number to airtel one & half months ago. I submit all the documents what is needed in the process. But still my number is not working. Always it shows network error. My sim still not working. I asked customer care of airtel also. They convince me as they will resolve the problem. But still nothing and at last i need to message here.
Need your suggestion!!!
My number is [protected]... From assam, dist.-nalbari.