Webuycars south is a **** they sold me a car which i drove a day then i realised it had issues, i reported the issue the collected the car to fix it for a week

Webuycars south is a **** they sold me a car which i drove a day then i realised it had issues, i reported the issue the collected the car to fix it for a week. I went yesterday to pick up the as i was told it was fixed on my way home epc and engine light on the car. Haven’t had the car not even 2 consecutive days but already experiencing major issues. How did the car pass roadworthy with so much issues?