Ill treatment that clients get from Cash Crusaders

I purchased a PC , on the 27th Nov 2020 ,the amount at R2 300 , I couldn't connect it at home. So, I went back to the store for assistance as they promised. The salesman asked one of his colleagues to come and assist me on 30th Nov 2020 , in short ... he couldn't manage . The salesman came himself on the 12th of Dec and detected the port that is not working , he used another port , I also asked him to connect the WiFi and he showed that the computer had a problem with the hard drive. He promised to come back at another day , he didn't and I returned the PC on the 9th of Jan 2021 and heard that the salesman had resigned . The other employee in charge said he will send it to a technician so, I haven't received it yet . I asked them to refund me my money because the computer they had sent to the technician hasn't come back .Then the employee in charge said he will refer the predicament to the owner of the business. He arrived and then he said that I must bring the salesman that helped me throughout the deal as if it was a private deal . I felt as if I was being disrespected .