TV Damaged

Hi I bought a TV at makro on 27 August last year an open box TV (meaning some one bought and return it at a price of 14000) in December TV started developing different color lines , I reported this to Makro Woodmead where I bought the TV and they requested for some pictures of which I sent,they then sent CN Tronics to come and collect on the 10th of December. On the 20th I started to ask questions of the progress of the TV that's when I been told that I have damaged the TV I have to pay R8700 to get the screen of I had neva damaged can you please help 🙏