So disappointed

I'm not usually one to complain due to having worked in the retail sector for the past several years, but I'm just so bothered by what happened at Cell C. I signed a contract with them and took home a brand new phone. A little over a month and the phone's entire camera gave up and it was overheating. How is it plausible to tell me it has to go in for repair when it is only a month old and that it will be away for up to 21 days? I am now paying a monthly subscription for a phone which I do not have, first of all, and secondly, is faulty goods. What happens if the unit breaks again after this? I must then sit again without a phone which I use for business purposes? The consumer act protects me against such things and says I have right to have the unit replaced within 6 months. Why was I forced to send it in for repair? My complaint is not against the service of the branch, but rather the way in which the situation has been dealt with. I want to know why my unit is not being replaced. I'm really upset because I had been with Cell C previously without hassle, so trusted that this time would be no different.