Samsung appaling service

I bought a Samsung 65Inch UHD TV at Makro last year. The TV is still under warranty. There was a crack on the cover of the TV. I reported the matter to Samsung repair centre. Technicians came out to assess the TV. The LCD was replaced then I noticed that the picture quality was no longer the same, it was midsty, faded, distorted and I reported this issue to the repair centre. Their inhouse technician came onsite to check the LCD, in his report he mentioned the issues I am experiencing.I recieved a call today and I was told there is no issues with my LCD, they are closing the ticket.I have asked them to bring back the Original LCD because I did not have any issues with it.i have issues with the replaced LCD. I feel that Samsung do not care.all I need is my UHD Lcd back. I am not enjoying the view on my TV.