Solar Star Hout Bay

Hi, I would just like to share my experience with you of Solar Start in Hout Bay. Last year December I bought an inverter which the owner of the shop told me was a Pure Sinewave inverter with which I would be able to run my TV and other electronics from a deep cell during load shedding. I took it home and that day there was load shedding. Unfortunately there was extremely bad electrical buzzing sound coming from any appliance I plugged into the inverter. I called the shop immediately to inform the sales rep of the issue as I couldn’t return it before they closed for the year. As business opened this year, I returned the inverter, however it had a minor cosmetic scratch (as shown in the photos attached). The shop owner was very apprehensive because of the scratch which I find ridiculous as it is only cosmetic and would not affect any components making the unit run. He proceeded to test the unit with a light in the shop which made the same buzzing sound that I had heard from my TV and other appliances. He then told me that it was normal for a light to make that noise (which I know is untrue as I worked as an electrician for a year for my father) and after further debate I asked if I should bring my television out of my lounge to the store to prove to him that there was something wrong with the unit. The fact that I would have to bring a TV out of my own lounge to prove my point is bizarre and bad business practice. However, I proceeded to bring in my TV which instantly made the buzzing sound. The owner of the shop looked at me while we both listened to the sound and told me he couldn’t hear anything. Frustrated and furious, I stormed out of the shop feeling that there was no way of rationally speaking to this person. When I calmed down, I thought that maybe I was in the wrong and that there could possibly be something faulty on my side, so I went to several electricians and companies who sell inverters, all of which who confirmed that the inverter was not Pure Sinewave as the owner had specifically promised me. I went back to the owner with this information who then called me a liar and said that he could not take the unit back due to the tiny cosmetic scratch. I took the unit to 5 paint shops to try please the owner, however he still would not take it back. If any of you buy anything at Solar Star, make sure to get your guarantees in writing! I’m honestly feeling so flabbergasted by this whole scenario and the effort I had to go through as a customer, I don’t even know what to do. Should I pursue this under the consumer rights act or should I just accept the loss and simply never go back to Solar Star?