Unhappy Hisense Customer

I bought an UHD 50inch television model N3 on 30 September 2017 at Hi-Fi Corporation Amanzimtoti. I have never been so disappointed. If you do not sit right in front of the television, the color fades and appears whiter. I have complaint, had to take television in and agents visited my home. They all see what I see, but yet Hisense say it is normal for that television. I cannot accept or believe it. Then Hisense is telling me that they make poor quality televisions? Never did Hisense contacted me or send out any of their own staff. They promised to contact me on Facebook. Nothing came of that. I have offered Hi-Fi Corp to pay in for a better quality television, but Hisense is not willing to comply as my original complaint was after the original 7 days. Every day I look at the television, it is a HUGE disappointment. I always thought Hisense is a better brand that this. So much for "local is lekker".