Railwire — broadband disconnection refund charges refused

Address:

Satna, Madhya Pradesh, 485001

I took railwire internet connection few years ago, and while making connection the DO NOT DISTURB(railwire supplier in my area ) took 7300 as connection charge which included 6000 for air grid and 1000 for the modem. For air grid he told whenever i will have to end the service, they will refund the amount of air grid. Now when I want a refund they are saying the never said about a refund.