Faulty laptop

Purchased a brand new Asus laptop for my son on Friday,according to the sales guy it was on special for R5000 and it was the last item.He asked why we needed it so my son explained it was for varsity,he said it was an excellent buy.We Purchased laptop n started in up on Saturday, it took forever to come on,the screen was glitching,apps took like 10 to 15 mins to open n it was jus freezing.We tried calling the store but the fone jus rings,eventually sum1 answered and transfered us tru to the department, only for the call to be dropped.We went into store on Monday wit laptop, we were told no exchange or refund, they wil send it in for 21days to get checked up.I feel that's so unfair as it wasn't R50 or R500,n for something that's not working now we have to wait a while til we get it back.Sales guy was called in,he said it's not his problem,customer services mus deal wit it,I have always Purchased my electrical items from game store but wit ths experience I definitely wil not frequent the store again