Samsung SA poor quality goods & services

I purchased a 55” Samsung TV at Tafelberg furnishes Diep River Store, March 2021. The TV was priced at r10 999 in which i payed cash, which was saved toward over a period of time. I firmly believe in paying extra for quality. On the date of purchase 1 year ago my TV was mounted and untouched since. I have now noted several lines running accross the screen, and googled what this may be. At this time i became aware that there are several similar complaints with the same series TV. I contacted the store at which i purchased and Samsung sent a technician out to assess the TV screen issue. 2 mins into the assessment the technician reported its irreparable at that moment in time and needs to go to a repair store. I have asked Samsung for a replacement unit as i am not happy for an appliance that i spent r10 999 on to be worked on WITHOUT A WARRANTY ON A REPAIRED PART. Samsung has denied my request , after spending several times on the call with different people from different departments. I am utterly disappointed with Samsung SA as i saved for this specific unit (rather than cheaper competitive brands) in belief that its of utmost quality!