Not sure what your local laws allow, but I would go file a small claims action. No teeth for collections around here, but at least you should be able to get a judgement. Get pics of the piles of leaves you made, print out your e-mail correspondence and any other records you may have including Work Orders sending your crew out.
Out of habit of doing work for Banks, I always take pics before and after every job. Takes a couple minutes, priceless for deadbeats. Nothing like a time stamped, date stamped before and after to end the whole "you never came" discussion.
Best of luck, deadbeats suck!
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