Car problem

I bought 2 cars from we buy cars in a week in January now the bakkie is overheating and I was told that when a car gives me a problem I should bring it back now they say they can't fix the car because I signed a dekra report but on dekra it mentioned oil leak nd damaged front sit

I even paid the tow truck out of my pocket to the workshop to me this truck had that problem but now m worried how they treat me after I purchased 2 cars,I was the best customer when I was buying but now to them m nothing I emailed all the the concerns to Etnee and she responded and declined my concern