Defective TV

I purchased a TV at DionWired 2018/09/06. A week later I noticed a black line across the screen, I immediately contacted DionWired tygervalley branch. I was told a LG Electronics South Africa technician will do an assessment on my TV. The assessment was completely, the technician informed it is a line of dead pixels. I was then asked by the tech if i'd like a replacement TV or my money back, at the time I wanted a replacement TV. I signed a job card, told me LG Electronics South Africa would be in contact within a week, which did not happen. I contacted DionWired a few times just to be told they'll get back to me, which of course they have not. I can't be expected to accept this faulty TV. I need a response from LG Electronics South Africa Head Office and DionWired as to how they are going to fix this problem immediately. The service of both businesses are pathetic and I will not purchase anything at either of these stores again. Their service to consumers is disgraceful and discreditable.