Sold me a car with engine fault and they refuse to

I bought a car in September from McGee's Auto. On the second day I had the car an engine warning light came on the dashboard, I took the car back to them and they promised to fix the car, they gave it back to me and sais it was fixed. The light came back on and after several attempts of me taking the car to them to fix it, I demanded a refund and left the car with them. They still have the car and they are not willing to fix or refund my money. The owner Tony McGeer told me to go f*** off his premises and sais he won't refund me.