Delhi Jal Board — Delhi Jal Board sending bill without any consumption

Bill no[protected]
I have been charged 5551rs without any water consumption. Connection is taken at this address KHNO 12-10 Uttrakhand, Jindpur Village ND-110036 and the KNO-[protected]. That house is empty no one live there since 2017 and there is no water tank in that house. We paid the connection fees 6500rs When we applied for connection. Even we haven't connected the main DJB pipeline with that house. So why Delhi Jal Board sending us bill When we are not consuming water, even pipes also didn't connected. I am a poor person please have a look on my problem as soon as possible. We took water connection from Delhi Jal Board for future connection. and already paid the new connection fees. Please DJB solve this issue.