Pathetic customer service on brand new UHD TV

I bought a LG UHD TV at Makro in Springfield with a two year warranty. Some pixels in the bottom right part of the screen had some kind of green discolouration when the TV is on. LG sent out a technician to inspect the TV during load-shedding, which did not help as the problem can only been seen while the TV is on. They then requested that I send a picture of the fault to the technician when the TV was on. The LG technician then told me that it is my fault and refused to help based on the picture I sent. I went back to Makro and complained about the issue repeatedly, Makro then requested that LG send a senior technician on three separate occasions. However, nothing happened. I have contacted the LG call centre personally several times over the past two months but am still unable to resolve this issue and am fed up with the pathetic service, especially when I had to pay R20 000 for this damn TV.