If he owns the shop go after the shop
I would place an add in a local news paper stating that the owner so said shop stole x amount of money from you. I am sure that would get his attention. Or may be a local flyer type thing with the same info on it and even deliver some flyers to his shop.
If he doesn’t own the shop send his boss a letter stating that you are going to the above if he doesn’t pay the money he owes you.
Also send a letter to neighbors and a copy of the letter to him
that would be a waste of time an effort for me.. I'd be knockin on his door ..I would get better results
