Laptop not working.my right as a customer violeted

on sunday i went to game store at Southgate to buy a laptop for my son, I was told that for it to be set up i have to pay R1500,which i refused ,the service was great ,until on Tuesday when my son to switched it on ,and after a few minutes it went off ,he tried charging it and it couldnt come on and it was hot when you touch, he went to Southgate to report they told him that it has to be sent for repairs, when i called them they told me that they can me a number to call so i can arrange to take it to be fixed ,or wait for them to do it which was gona take about 21 days ,i tried to explain that my son uses it for his studies and that it is still new ,we haven't used it they insisted that they will take it in for repairs ,i told them it was still within 7 days they can still change it or refund the floor manager and the manager ,they refused to assist me, they insisted on sending it for repairs ,my son is missing out on his lessons ,am so angry i don't think i will ever set my foot at that store or recommend anyone to go there