Water reading problems

[Chealse Deese]

Im not really sure what else to do about my water situation my bill on Average is about 75$ water and 40$ sewer a month well recently I received a bill for 413$ for one month they came  and looked at my meter and said there wasn't any leaks reading so I had my landlord come  to look under the house a small leak was found but said it couldn't have went up that high I have a 600$ water bill and a 700$ sewer bill and no leaks were found what do I do now?