I got a new customer at the end of the season about Mid Oct. PRIOR to me starting, The lawn was very brown (looked dead) in a large portion of his front yard. (this is a million $ home) I've been cutting forever but outside of that I don't get the opportunity to do side jobs. Well to cut it short, he had grubs and the sprinkler system wasn't always on. So I applied Dylox from Lesco (dont even say it I know) Anyways it worked so about about two weeks later he moaning and groaning I WANT A GREEN LAWN,, well I say I can aerate and overseed your property. Ok all is good so I do the job (18,000 sqft) I cut the lawn then did the work. The lawn was soaking wet when I did it so a couple of days later I stop by and he says oh Johnnie (thats what he decided to call me) the lawn its so wet shut off the sprinkler sytem in the garage,, I said no I'll slow it down maybe water 2 or 3 times a week instead of EVERY DAM DAY. So a day goes by and he get this Stops by my house and says I shut the water off so come over and turn the system off. Now I should have mentioned he's Spanish and its alway broken up. So anyway I say ok I'll be over tomorrow. well a week or two goes by and the lawn is not germanating I said dont worry it will grow,, TWO DAYS LATER WE GOT FROST then back to warmer weather. Another week goes by and he's still stopping by complaining.. Well all said I only charged him $410 + $50 for the cut... No payment now since October.. I tried calling he said NO I NO GET NO BILL. So then he'll call me back,,,,, well its been 2 months and nothing.. Can I put down ROUNDUP. What kind of letter should I write because everytime I call him he forgets who I am and it takes awhile for him to remember.. WTF should I do?