Honestly, if you want my opinion- tell him you'll give him the files, and take your $150. Then walk away and never speak to him again. Benefits: you free up ti

Honestly, if you want my opinion- tell him you'll give him the files, and take your $150. Then walk away and never speak to him again. Benefits: you free up time, you get him off your back, and if he wants to take you to small claim court for $150, he can (but he won't). It's just not worth it.