Northern Quality Construction

So disappointed that Kevin subcontracted my roof project to another company! He sent a crew to my house that could not speak English and he was not at the jobsite to supervise. I had to call him repeatedly begging him to come over to the house and send a translator because the first crew was putting ice and water shield over the metal valleys and they were only adding one row of Ice and water shield to the eves!! He also said he was too busy to finish this week, and so he asked the subcontractors to put a tarp on my roof which did little to prevent water from getting inside. Because he refused to come to the jobsite and be the supervisor, the finished project was incomplete and now I need to hire a another company to finish the job and remove the roofing debris. When I tried to pay the final invoice, he added several hidden charges and when I said this was not fair, he said he will put a lien on my house for the $600 difference! What should I do? I guess he knows that it is cheaper for me to pay than to fight this. I don't know what to do?