No customer service for faulty devices

We bought 2' mi tv sticks at R800 each. After about 20 minutes it starts to reboot loop. Took it back, they refused us a refund, did some own updates, got it back, still same issue and still they refuse a refund. What ever happened to the consumer protection act. Should we add another couple of thousand rands to our name an take it to our lawyer, they treat you like ****, we, the clients who are the sole reason for their existence. I don't get is. Well. I will get my lawyer on them!!!!!