Fixify Appliance Repair

We hired Sam to install our new dishwasher. Although he asked for a higher price than all other contractors, we hired him because we figured he will be good. Once he arrived and saw our pipes, he said he doesnt do plumbing. We suggested to stop the contract but he insisted of doing it. During the work, he tried charge us $83 for a hose which could be purchased for $20 at any store. Long story short, at the time he was done everything he could do, the dishwasher still didn't work. We offered to pay him partially for the half job he did but he wouldn't leave till we paid him in full. We offered to pay him through e-transfer but he wanted cash. We gave him two $100 and one $50 bills but he claimed we only paid him $200. We wrote him a very negative review. He responded with the promise of refund us partially. We later contacted him for the refund but he insisted that we need to remove the negative review first. So we contacted Home Star to remove the review and tried to contact him again for the refund. He hasn't answered or returned our calls.