Makro has turned my study life upside down!

How a simple trip to purchase a laptop that I had long saved up for would turn my life upside down. If anyone cares to know, do not purchase a laptop at a Makro South Africa store!!! I am so disappointed with Makro Wonderboom store . I bought a laptop from them exactly a week ago upon opening it I realised the screen had a little dot on it. I decided that I would return it but because of work commitments could not do so immediately , only got to go today as it is a holiday. Initially I was told that goods returned within 14 days would be replaced or refunded. However the store told me that they would not refund nor replace my laptop as they have to assess it which takes 21 working days, this after I explained that I do online studies and cannot simply afford to be without a laptop for that long especially when I didn't cause any damage to it. With that being said I asked for a refund so I can purchase another laptop to which they refused. I spoke to their call centre agents, team leaders and everyone they could possibly put me through to. Long story short, I am without a laptop, I will have to deregister a module as I have no laptop and worst of all I can only register it again next year...I also blame myself as my colleagues had warned me against purchasing such a pricey laptop at Makro instead of reputable electronics stores.