Bad service

Morning i am a pensioner i who whose been fooled and played by 2 big companies 19 December 2024 i bought a Defy water despenser fridge at Fair price 48 Pritchard street, car Rissik street Johannesburg CBD Gauteng for R 6000 i paid cash exclusive the delivery fee i paid R250. Their guarantee is 2 years then April i noticed the fridge has a problem it freeze on top but the freezer is at the bottom but with this everything i put on top freeze, then June 5th i went to report the matter then i was assisted by Lucky he gave me his number and the defy number. Then they sent a technician that came and change the botton that ables to adjust the fridge temperature and left. But it encountered the same problem then i went back to the shop it still do the same thing, when ever i go there i take public transport as i can not walk to town they sent another technician again on the 7 of August 2025 when he comes he claim there is nothing wrong with the fridge, he shift it left and right i told him how come he claim he has it fixed yet it's still freezing we had an argument cause just shifting it and claim its going tobe ok that's not i expectedas i am the one sufferingif the fridge i paid to keep my food and last long but now things get spoiled , he asked me to sign papers that he fixed the fridge i refused asked for his name he refused and gave me his contact number ***. But same thing continues on the 8th August i went back to the shop i got assisted by a shop manager he called Defy then the Defy told him they should rather replace the fridge or send the manager to come and check the fridge then i will get a new one, I came back on the 15th i went back again i found lucky who sold the fridge to as their sales representative, he promised to report to the manager then I went back home. 18th of August 2025 i received a call from Fair price manager that he is confused the matter is out of his hands because he contacted Defy and told him I as a customer i am happy my fridge is fixed, what makes me furious i struggle with what i paid for guarantee is still on I'm going up and down nothing is fixed but being ****,i want my money back or they should take their fridge and bring the new one i am tired please help as a pensioner and old woman,if the matter is out of the shop manager's hand i thank you.