I thought I hired a licensed contractor but found out after they started that their license had been suspended. I thought I had done my due diligence by looking them up on the ROC. When I checked they had their license. Unfortunately, their license was suspended a few days before they sent me an estimate. I electronically signed the estimate they sent and paid them a down payment of $500. The remaining $3000 was to be paid after they completed their work. I have no faith that the work was done correctly if at all and I will need to get a licensed plumber out to check. Can I fire them and withhold payment since they misrepresented themselves by listing their ROC number plus they sent someone who self-declared that they are not a plumber to fix my pipe? Do I even have an actual contract if no company agent signed?