Very Bad After Sales Service for Defect TV Purchased

With the start of the Black Friday hype last week, Samsung already started offering clients Black Friday specials on Wednesday and so I bought myself the new 49 inch Samsung Curved UHD TV for R7999.99 cash. When I arrived home I opened the box and installed the TV but then I discovered that the AV input is faulty and not picking up my dstv signal - (samsung actually said when I purchased the tv that the tv was already tested and all is in order according to them). I was then able to eventually get signal by putting an object underneath the input to keep it intact. The next day I informed the sales person at the store about my issue and arranged that I will only be able to bring the TV back to them the Sunday and so on Sunday they took the TV back and said they will come back to me the next day. Monday they confirmed the tv is faulty and they cannot provide me with an new tv as they do not have stock anymore of this same tv. The best they can do is to provide me with an new flat screen Full HD and not UHD for the same price. I informed them that I cannot accept a lower quality tv and want the same quality as what I have purchased. Since Monday I must constantly phone them for feedback and even when they say they will phone back they do not come back to me until I phone them again. Today is Wednesday and I still do not have any feedback or a new TV. I also requested the manager must phone me but I am still waiting. We planning to build our house next year and I actually thought I will purchase more samsung appliances and electronics for the new house but after receiving this kind of service I do not think I will ever buy from Samsung Store Canal Walk again.