Online Data Entry Fraud

Hello I signed a contract with a company named WIXON INTERNATIONAL. They asked me to fill 500 forms with 90% accuracy in 5 days and that they will pay me 24k in which they will deduct some registration fee and I will receive around 17k, to which I agreed to. I got some queries while doing the work and I repeatedly called each contact provided but they didn't respond neither my texts nor my calls, even I've mailed their official mail ID many times that I am facing this and this issue also that a lot of data provided is very messed up and I couldn't understand but they didn't reply to any of it. Just after completion of 5 days they mailed me, and gave me legal notice that I've to pay this this amount otherwise I've to go to court and settle the case there. I would have done the whole work but they didn't help me in anyway. I've also seen many videos on YouTube related to this and found that many people have been fooled by companies like these, also even if someone has completed the work they had send the legal notice to them too. Please help and tell what to do.