Customer Protection Act

I have bought a Samsung Z4 Cell phone on the 29 of July 2018 and the person who sold the phone to me did not advise me that the phone is not supported by Android, i struggled with the phone for a month and took it back as it was freezing, not reading my memory card and did not update any of my apps, i returned the phone on the 26 of September 2018 and i stated that i do not want the phone back as its my consumer right as the phone was not even 6 months old, As per Customer Protection Act i have a right to a full refund or exchange if the item is within the CPA Period of 6 months, i have stayed a full month of October without having a phone and they only contacted me on the 31/10/2018 and Lawrence as he is the one i have been communicating with from store told me that i should the store is refusing to give a new phone or my money back. i have been calling the store for the whole month asking on the progress of the credit and Nyeledzani kept saying she will get back to me and she didn't even bother getting back to me...Please assist me with this regards.