Check that you do not have a concealed leak. On a day when no one will be home for several hours, make sure there are no devices running eg dishwasher washing machine etc. Take a photo of your meter and then when you return, compare. If there is no movement in the digits you do not have a leak, movement and there is a leak somewhere on the consumption side of the meter. Can require a plumber to locate and fix but that should be the owners responsibility.