Poor service delivery with damaged machine

I bought Lenovo laptop at Makro in Germiston march last year, I didn't use it for two month because I bought it for studies. When I started to use it in June it was having a blue screen error. I took it to Makro in Germiston, they installed new windows and said if it gives me problems again I can take it to the nearest Makro. It gave me same problem again after two moths I took it to Makro in Brakpan, technician checked it and said it should be fine, it gave me the same problem after a month, I too it to Makro again they booked it to the supplier for two weeks, on the same day after it was coming from repairs it gave me blue screen error again. I took it to makro and they have booked it to Lenovo again, now it has been more than a month without a laptop and I'm using it to attend my online studies it never work for me since from day one I paid my R5000 for it. Its like I have put my money on drain. I can't study now because I don't have material to study while I have paid my R5000 for it. If they cant fix this laptop why they are not giving me another laptop cause I am suffering with my money, I'm behind on my studies waiting for something which I don't know when is it coming back or will it be fixed when its back.