I got robbed don't trust anyone!

So i met with a buyer to sell an electronic item that requires to be plugged in to function, he wanted to see it working, we met at his place of work but his boss didn't allow him to test it out, he offered to pay me half the price then the other half tomorrow so he can make sure it's working, i agreed being the simple human i am or shall i say a dumb one, i thought to myself i know where he works im sure he's not gonna scam me, so yeah next day come by and surprise surprise he ghosted me until i mentioned the cops to which he said "i paid you in full what are you saying?" there is no evidence that he didnt pay me in full so yeah i fucked up, now im not the type of person to show up and do something as i would be the one that would end up prosecuted, i took the lose, its a very expensive lesson, but i wonder if karma will avenge me. this is a real story and not a troll, yes people like me do exist and yes this shit happens, live and learn. peace y'all.