I did this cleanup for a guy, seemed like the nicest guy in the world, no kidding I thought the guy new me personally somehow everytime he called when we were discussing the work to be done. Well I removed all the leaves, 1100 lbs. worth according to dump scales, debris and a pile of brush from the back lawn. His invoice was returned in the mail 'no forwarding address- return to sender'. I left an invoice on his door a few weeks ago. There are 2 letters from other contractors as well as a few business cards from other people trying to reach him. Early yesterday morning I went by thinking maybe I'll catch the low life at home, nope, but someone had thrown something through one of the windows, obviously he has p*ssed off a few people. How should I handle this?