2 X Faulty fridges supp**** by defy

I purchsed a defy fridge from makro that was faulty, defy first told me the fridge was fine but it was making a hige noise and was freezing on the lowest setting. first tehcnician told me it was fine. I was still not happy so another technician came to tell me the thermostat is faulty, they then agreed to replace the fridge. I have just received the replacement fridge and the fridge is second hand, damaged and it looks like it has been repaired before. I am extremely unhappy and this needs to be rectified as a matter of urgency.