Samsung Incompetency/ Inefficiency

I purchased a Samsung four door fridge (French door) for about R40000 from Dion in less than 2 years ago. Samsung being a reputable brand I did not mind spending so much on a fridge with the hope that I will be getting a full value of what I paid for. The fridge stopped working and I logged a call direct with Samsung on the 7th of October to report it. Technician was sent through in 2 days but he never solved my problem. I called again on the 8th and was promised the other technician will be sent through 2 days later again. He came through but could not solve the issue again, the temperature was still very high. I called again on Monday the 12th of Oct reporting the same problem and another technician was sent through but the problem was still not solved. I called Samsung again on the 16th to report that everything in the fridge was getting spoilt, as I buy monthly groceries for my family, and they promised to resolve my issue but it never happened. My heart sank when I took out groceries worth about R6000 and had to throw it all in the bin. Till today Samsung has not done anything to help me out. I request they replace this fridge to avoid future problems. Please HELP ME!