Defect TV

I purchased a hisense television on the 24th of July 2021 at makro wonderboom and on the 06th of January 2022 the TV started showing stripes on the screen. I took it to makro stores on the 15th of January 2022 and they told me the TV has a crack and it cannot be fixed. What is shocking is that the crack is not visible to the eyes. They told me to contact hisense and I did that and they brought a technician who indeed said the TV has a crack. What is frustrating is that there is no crack on the TV, they are insisting the crack can only be seen using their machines. This means we could have bought this TV and it already had this crack as it is not visible to the naked eye. It has been six months only and it is horrific to be told the TV has a Crack that is not visible to our eyes but only visible to hisense eyes and makro eyes only