Poor Customer service / Poor quality Goods Sold

Bought a pair of sneaker by Superbalist of R1600 to find 3 months after purchasing it and obviously wearing it it tore on the side which is undetectable and close to the sole. According to the CPA and laws that are in place for consumers warranty of defect items is 6 months from date of purchase. I had this sneaker for 3 months and not even wearing daily or does not do heavy walking and running, yet it broke after 3 months and Superbalist refuse to replace or refund. I find this completely unacceptable as I did not inspect the shoe when I purchased it as it seems like there could have been a small tear which obviously tore further due to me wearing it. Are their goods even legit, because New Balance are supposed to be a good brand and with me having so many sneaker, it never happened to any of my other sneakers.