Not fit for Purpose

On 9 December 2019, I purchased a 32" Sinotec HD Ready Smart TV at Markro Strubens Valley. I told the gentleman who assisted me, that it was to be used to access the internet for online games. He assured me that the TV I was about to purchase, would be suitable for that purposes. We only managed to get the TV installed about 8 days after I had purchased it. The installation was done by a professional TV/DSTV installer. After numerous unsuccessful attempts to log onto the internet, (you tube etc) nothing would load. I then took the TV back to Makro Woodmead, and they then sent it away to be checked. About 3 weeks later, I was advised to collect the TV. Upon doing so, I was told that the TV had been repaired, but he was not able to tell me what the problem was, or what the actual repair was that had been carried out. I then got the TV reinstalled, but we still had the same issues. I then decided to go back to the store from which I had bought the TV, and went to speak to one of the sales consultants in the TV department. To my horror, he told me that the TV that I had purchased was not suitable for what we wanted to do, as it did not include the android operating system. I then asked if I could not return the TV, for an upgrade. This he said was not possible. I feel that I have been sold a product that is not fit for purpose. I do not want a refund, instead, all I would like to do, is return it and but a more expensive TV, which will meet my needs. I really feel as if I have been "done it"