Don't like getting f***** over

Someone thought I was trying to screw them so they decided to run off with the money that they owe me so the deal was $300 for it which was really cheap and I take a hundred for it and can pay in 200 payments or it was $400 they don't remember the exact price I think it's on the video but he didn't know anything about bios and if it the 59 3900x won't work in that board if I already put the BIOS to the 5900x Thomas bios problem he decided to buy a power supply and this and that and say what I told them was crap