640 Acres - 3/24/2018 09:25 Tape a note on his door saying: If you can afford a trip to Mexico then you can afford to pay your bill of $5000 to me for services rendered that was due 4 months ago. Make sure it’s very visible so that when he gets back that’s the first thing he has to think about. Maybe his wife doesn’t know about it and it will shame her into getting him to pay you. Then just become a pest to him and do the other things mentioned in the other posts (interest, etc).