Markham's disgusting customer service

I'm disappointed at the way Markham has treated me. I bought a smartphone at Markham Galleria in December, least did i know that the phone was dysfunctional, the phone misbehaved early in January and I took it to the store, they took it to repairs, after two weeks it was returned, the phone misbehave again, they took it in for the second time of repairs, returned after almost two weeks still misbehaving, when I took it in, they said they will book it in for a third time in repairs and they "laughed" somehow they are amused by fault phones sell when they are returned, isn't obvious that those who do repairs have failed or is it that they want the six month return policy expire, they are dragging the matter and time is counting. I made a complaint on Monday ( 18-02-19) to the Foschini group, up until now no response and I don't have the smartphone. It seems I'm not the one who have been *****ed by Markham but they are doing it all over.