Poor quality of Fridge and bad customer service

I bought a defy fridge from Russells Lephalale on 30 November 2018 after 2 months the top part of the fridge(the chiller) started to malfunction- Thus it would get cold and then get hot until all the ice in the chiller is melted and start getting cold again which affected the quality of the food and perishables inside the fridge and some started to get rotten, on the 3 month it stopped working completely, the bottom part of the fridge the Freezer) was however working/ or seemed to be working. I reported it at the store and a person was sent to my house on 27 March 2019 to fix the fridge. To my surprise the person said the fridge needed a gas refill which did not make sense because the freezer was working only the chiller that had issues. Reference number for the call was: BA-Defy-***. again 2 months later the chiller started with the same problem, then on the 3 month the freezer also stopped working and once again the my food and perishables got rotten. I went to the store on 8 July 2019 to report the issue and to ask them to replace the fridge, but I was told that they will only consider changing the fridge after trying to repair it 3 times. they said they will log a call an call me back with a way forward, till today I have not received any call. I tried to call the number they gave to me but there is no response. I am not happy and I want them to replace the fridge as I do not see any value for my money instead this fridge is causing me more expenses. I regret the day I went into that store to buy and I will never make that mistake again. I will never recommend anyone to buy at Russells ever again as they do not value their customers.