Dollar General review: Yard crew

I live next door to the Dollar General on Shelby Road in Kings Mountain, NC. The people mowing the grass are not mowing next to my lot. I have asked them several times to mow their part of the yard. I have shown them the property line but they still do not mow the grass. If I have to keep paying someone I am going to have to send you a bill. Please help me with this issue.