Yeah you could. You could also send pizzas, and swat him.
That would only cost more, and things like these would take time. Sometimes its better to cause continuous disturbance, as then he'll have 2 choices which are :
a) move out
b) refund to prevent further disturbance to him and his family.
harassing someone like that is likely to backfire so don't
is he's in the US or some other semi-civilized country file a police report and/or IC3 complaint... it's not that hard and can have more serious effect than a pizza
this sometimes works on ebay deadbeats so might work here too but obviously there needs to be some sort of evidence... forum PMs and blockchain TXs can be hard to explain