I had a customer hire someone else to do all their flowerbed renovation, remove a few shrubs and stuff. I showed up to cut the lawn and there they were, working and had the truck and other equipment all over the lawn. I dropped them that day. Another one. Lady "thinks" that if she makes the flowerbed larger it will be easier to cut the lawn. WRONG, she made it bigger on a hill. The hill get progressively steeper as you go. Now I have to use a string trimmer to do a potion of the lawn. When she did this she said she thought it would make it easier to cut the lawn. I told the opposite and said I have to raise the weekly price! She didn't like the idea but hey, she's the one that made the matter more difficult. I still have her and make a solid dollar a minute. As for the OP. Yeah you screwed up. Just make sure you close the gate when you're done. It's really that simple. If it was closed when you got there, it should be closed when you leave.