Contact as many consumer protection agencies as you can locate. BBB, Attorney General, Chamber of Commerce, local police, State police, AFT. Write a letter to the editor of his local paper. Whatever you can think of. Bombard him with inquiries and other annoyances. Call him frequently and complain. Threaten legal action. Don't let up. As a former debt collector I know it can often be hard to get the message through, you have to be persistent. Demand action "now", but don't threaten physical harm.
Good luck.
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