His hose is on!

I came home from working back to where I petsit. The neighbours hose was running all over his driveway and my driveway plus the road. Water isnt cheap here, in my house its about $200 - $800 (usually in the middle average a month) thats just for showers, laundry, and so on. It must of been running for awhile since there was big puddles all over and like a lake basically. To be nice I went over and knocked on their door. I didnt want to go sneaking around their house to shut it off, and scare them. The guy was a real d*ck, and going on rudely how its my hose. So I thought maybe it is, I just left since he was real rude, its his problem and money wasting. I knew there was a hose behind the hose here, I called the people I petsit for and they said thats the one and only. I went out with a flashligt and it was off all nicely wrapped on the hanger. I went out front and the hose goes to the other side of their house (neighbours), and noone else lives on the other side of the neighbours. I thought yo u want to be so rude, I went back inside and its still going they can pay the high costs of water. I went up and told him and he didnt want to listen. A few minutes later the neighbour from the other side of me comes knocking on my door saying about the water, and I showed him it wasnt here, so he went over and knocked on the door, same thing the guy was rude saying it was at my house so he just went home, and ignored him.