Mahanagar Gas — Meter lost by MGL

Our building went for redevelopment and was demolished. Before that we vacated the premise and handed over the flats to the builder. Builder informed concerned authorities to disconnect mahanagar gas and adani electricity connections.
Mahanagar gas executive seem to have come and disconnected the supply and took away meters.
However despite two months gone by they are generating the bills and saying that meter is lost.
They are asking us to file police NC and affidavit for no fault of our own.
This is cheating by MGL.
They are expected to close the connection in system.