FAULTY DEFY FRIDGE

I bought a fridge on the 18th of April 2022. A Defy F740 SXS Frost free Double door fridge with water dispenser. This has been the worst purchase of my life as the fridge has been problematic. They have sent through technicians twice and again the fridge is not cold which has resulted in loss to me as i have to dispose of food that has got rotten. Defy insists in Sending a technician for the third time and dont want to change the fridge which is faulty. People in the service department don't even respond back to our calls.