Unfairly treated customer

Bought a brand new Renault kiger received the car14 th September 2023,used the car for 2days,3rd day got stuck while on not drivable showing engine fault ,they towed the car back on the 17th,after 2day they told me it was a battery fault,I didn’t trust them ,i told them I don’t want the car anymore because they are not trustworthy and I don’t trust the car,ask them to cancel they deal because they are refusing to give me another car,after 2 weeks they sent an email that I must fetch the car they have fixed it , I responded I don’t want the car anymore, I feel I was treated unfairly as a customer hardly a week the car shows engine fault.