Sold me a Defective Laptop, now I have to wait

I bought a Laptop from Makro Amanzimtoti on 15 July 2018. I worked with the Laptop for 4 days, and then on 20 July 2018 it did not want to start-up again. I took it back to Makro on 20 July 2018, the technician said that he could reset Windows, but he said that would mean I would lose all my data, the Makro technician also said that this type of error should not happen on a new Laptop, and if he reset Windows it was likely that it would just happen again as there is clearly something wrong with the laptop. The Makro technician suggested that I request a refund or replacement unit. The technician working for Makro could see what is wrong, but I had to hand in the laptop for an assessment. When I phoned this morning, I was told that the laptop is still at the store and it will only be taken to the Makro assessment centre tomorrow when the driver goes there. Tomorrow Makro will have had this Laptop which I paid for, just as long as I had it before it did not want to work anymore. It is unacceptable that this laptop did not even work a week and now I have to wait for something that I was sold by Makro which was clearly defective. After the technician evaluated the Laptop the store should have been able to supply me with a replacement unit. I urgently need a refund so that I can get a working Laptop, you guys might have all the time in the world, but it is unacceptable that I have to just be patient after you guys sold me something defective