Paying for broken cellphone and poor service

I purchased a cellphone on the 27th of December 2017 at a Foschini branch, 10 weeks later (less than 3 months)I took the cellphone back to the store as the cellphone bend and the front and back covers/parts started to lift and pull apart. The phone was sent away and the report from the service provider stated that the cellphone is BER(Beyond Economical Repair) and that I dispose of it in an environmentally manner. I was called by the store associate and told to fetch my phone an advised continue paying the cellphone which I bought on my account. When I reported the matter to head office I got a call from the store manager 3 days later asking me what the matter is that she'll discuss it with her area manager to see if they can come up with a solution, a week later still no response I called the store she was occupied left a message and never got a response until 4 days later when I decided to call again the women had no clue as into who I was and what my case was about I had to refresh her memory and was told the area manager was in a "meeting" and she'll get back to me. Several hours I was called an informed NOTHING can be done they just following policy, Policy that's it no further elaboration as in what the policy state or which policy they referring to. It is but COMMON SENSE that one in their right mind finds it fair to pay for an item that they no longer can use which was not caused by their own negligence,nor is it possible for Foschini to guarantee that all cellphones sold by them is in 100% working condition which is evident in my case. I find the level of service putrid and clearly customer service and satisfication is not a PRIORITY.