I was spraying a clients yard this morning and the neighbor came out and asked for a price. I measured the yard and gave a quote and a contract and he signed and he left. The lady came out after i finished her yard. She said I need to get money in advance because he stiffed the guy that was mowing her yard. All i need is to chase someone down to pay. I told him I would be back next week before he left and I found this out. The yard is terrible it is going to take a lot of work. Should I leave it alone or just ask for advance or run?