Maharashtra Natural Gas [Mngl] — bill is not provided.

Address:

Pune, Maharashtra, 411028

I am not receiving any bill. When i am trying to pay bill online from mngl website http://billing.mngl.in/Payment.aspx but it giving error "record not found" after entering bp number.
I sent email to mngl customer care, after 3 days they asked me to provide the snap shot of meter, i have sent that to them long time back. Still issue is not resolved and they are not responding despite of asking to provide the updates.