My sisters lads friend is a dry stone waller, and he did a job for a farmer in the lakes and the guy would just not pay up, it went on for six months, so my sisters lad and his mate went over one evening and knocked down the walls they had rebuilt, the farmer then had to pay cash up front for the previous work and the work to get his walls rebuilt, word had got around and no one else was willing to touch him.
After that he never had a problem getting paid by him.