How to stop a neighbor who blatantly ignores property lines?

Question Details: Our new neighbors continue to knowingly mow our lawn. We have discussed our property line with them with our builders play in hand and have marked the location of our survey pins from our builder 5 years ago. In addition, our sidewalk has a hole from the builder, which was spray painter by a surveyor they hired and again by us. Despite this, they continue to blatantly mow right past the line by about a foot every single week. I have now also placed a flush yellow marker beside the survey pin in our yard. If they continue this nonsense, what is my next course of action? It's very intentional because we and 4 adjacent neighbors would not approve a fence on the property line when they bought their house.

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