[HELP] I(seller) and a buyer got scammed by a Nigerian group. Other person lost $750. Forgot about my $150 but I honestly want see justice to other person. He worked Hard with 2 jobs and got scammed by these bastards. Please help with guidance how to solve this.

I am a freelancer who has experienced a complex scam involving three scammers and another client named Jacob. Jacob paid $750 to scammer 1 for a project, but the work was incomplete and the files delivered were the same ones I created. Scammer 2, a friend of scammer 1, outsourced the work to me without telling me it was for Jacob, and I agreed to do it for $150. Scammer 3 placed a $50 order with me as part of this arrangement, but after I delivered the files, they delayed completion and never paid the remaining $100. Jacob and I connected on Reddit and discovered we were both victims of the same fraud. The scammers are now demanding an additional $750 from Jacob, and both of us have evidence of the scam.