Vehicle sold with defect

I bought a vehicle from them in October 2022 and the car over heated from their premises to my house (4km) I phoned them and told them the problem and they came to fetch the car to attend to the problem. Since then the car had the same problem over and over and has not been fixed until date. Now they say that 6 months has passed and that they are not going to fix it. The owner knew that he sold us a defect and just played for time!! Please do not buy from them!!