Just moved into a house that has a gas prepay meter with a top up card. Just went to stick Â£10 on it and noticed a debt of Â£35. So out of the Â£10 I topped up, it took Â£7 debt & left Â£3 for the gas, ie central heating.. That was at 17:00. It is now 18:24, and the prepay meter is reading Â£1.77!! Surely it cannot have cost Â£1.33 for 1.5 hours???? As its rented we have to stick with it. Is there something wrong? Does it wipe more off as its in debt?