FAULTY INVERTER - POOR SERVICE BY BUILDERS WAREHOUSE AND ELLIES

Beginning of 2023 I bought an inverter online from Ellies through Builders Warehouse. We connected our Television as per instruction leaflet and verified as per demonstration on Builders Warehouse video on YouTube. the first few days the inverter worked fantastic during loadshedding. Then during week 2 it just work for about an hour and a half (90min) From there it just went downwards. Fully charged it could only power between 60 to 90 minutes. the inverter were handed in at Builders Warehouse Bloemfontein, they sent it to Ellies for testing and repair. The inverter was at Builders Warehouse or Ellies for nearly 2 months. We received NO feedback and had to go to Builders W to enquire what was going on. The floor personnel had no clue as to where the inverter was, after searching it was found in a storeroom without the lead it was handed in with. according to the personnel at Builders W the inverter was now working a 100%. Upon arriving home we connected the inverter to be charged. There was a period of about 3 months we had no loadshedding. when LS started in our town once again we discovered the inverter was still only working for 60 to 90 minutes. over the next few days the working period got less and less. We took the inverter in to Builders W again for testing. We decided to ask for a refund as the inverter was obviously faulty from the start. After yet again no feedback we went to Builders W where we was informed that the battery is faulty and had to be replaced with costs to us. When asking for the job cards from Ellies repair and the testing reports for both times it could not be provided to us. The personnel was informed that we will not take the inverter before we have a complete fault report. Now suddenly there is a email that states the battery was exchanged the first time, we knew nothing of this, thats why we want the paperwork to see what was done to the inverter. It could just as well got damaged while in the storeroom at Builders W the first time or even while Ellis was "fixing/testing" the inverter. When askinf for a refund we were told there is a no refund policy. According to the CPA section 55 the following... the stores no refund policy cannot override the CPA requirements I feel that my money must be refunded as the product was faulty from day one and the repair/testing process lack proof of repair. The customer service we received was pathetic as their was no communication to let us know what is going on.