Damaged bad quality goods.Retailer refusing refund

I bought a cellphone protective cover for Samsung Galaxy S6 Edge,at Vodacom Chaz shop (next to Dischem) at Festival Mall, for R409. Few days after buying the product, I noticed the \clips"that hold the phone started decaying and breaking piece by piece. I went to the store and showed it to the manager who then booked it in to send it to the supplier for possible replacement.<br> <br> On the 7th October 2015 I got a new replacement cover. On Friday the 9th October I noticed the signs of damage again on the new cover. On Saturday the 10th October I went back to the shop to show it to the manager. He informed me that he cannot help me this time. I then requested a refund because his product are of bad quality but he refused"