Bad Sevice at Makro Centurion Gauteng South Africa - REAP OFF

So I just went to Makro Centurion this afternoon today at around 1pm today 12/07/2018 and bought 3 hp laptops. I swiped my debit card and laptops were fetched from the back in sealed boxes. I then took them home and opened immediately so i could load some Microsoft office on the 3 laptops. 2 of them were fine no issue the 3rd one's screen had lines on it after you switch on. Having seen this I took back the faulty one but was told to go return at their Returns section. I found a clerk who asked the manager Mr Manyani on what to do of which Mr Manyani asked me to wait for their technician to come and have a look. He had a look and confirmed that the laptop had an internal damage. Now I asked for returning that so it can be replaced with another but they refused saying it had to go to the supplier for assessment. OK so i had just spent like 2 hours waiting and the laptop was needed tommorrow Friday 13/07/2018 what could i do. So i asked for a refund so I could go buy another elsewhere bust still Mr Manyani refused. So now im stuck and each laptop was costing me ZAR4249-00. I told him about the urgency of the matter that i really needed the laptops for business as the owners are leaving by plane on tommorrow morning friday back to their countries but he still refused to assist. My question is how does such a thing happen with this Makro branch especially with a man like that. is it because i am a black man or he is just being unscroupulous . as we speak im stranded and do not know what to do. to make matters worse he tells me i should go to pinnacle who supp**** the laptop to them. and the pinnacle company is in Sandton where i have to drive and use fuel. if there is anyone who can assist please may you help i have run out of ideas. i just think Makro is just a reap off. Further i saw two people bringing defy fridges that were damaged and they also refused to replace them and to me it looked clear that the fridges got damaged when they were delivered to Makro.