A new block of 5 apartments & our gas bills vary wildly from $40 to $300+. My meter shows no movement (which should probably be my next door which is empty. My neighbours (a couple) have a $300+ bill whilst they have been away. Monitoring our meters is showing usage when no-one is home & no hot water being used. Residents have noticed a ‘hissing sound’ & elsewhere a gas smell. One plumber was called who said nothing is wrong. Clearly there is something very wrong.