They gave me a phone with software issues

I recently joined Telkom as a customer, and I can say I am not happy at all with the way I have been treated so far. I bought a phone (Huawei mate x 6) worth R60000 cash price. However, the phone gave me problems when I tried to set it up by myself and therefore, I returned to the store where I bought the phone the following day to seek assistance. They did not help me much and told me to come back again but I could not due to the kind of work I am doing. Instead, I visited another store in Bethal, and I did not receive help again. I am a truck driver, and I do not get much time to visit the stores and sadly, my type of work is now being used against me. They took the phone for 2months at a Highveld store saying they are fixing it and I am not happy to pay for a phone I did not break or cause harm to. Their policy does say if there is a software issue with the device and if it is returned within 5 days a new phone must be issued to the customer. I went to that store, and they did not assist me and now I have to pay for a phone that was opened and fixed because of their incompetency at the store. The repair center did inform me that the phone was opened, and they were waiting for spares. My issue is I will not be paying for a phone that has warehouse issues and not fixed because the device is very expensive and it is most likely to give me problems in the long run since it has been opened already. I really need this issue to be resolved.