Terrible warranty service

In November 2019 I bought a top of the range 55 inch Hisense OLED TV and it started developing black dots on the screen. A technician from Hisense collected the TV and said that I would have it back in two or three days. One week later and one dropped call after the other I decided to go and collect the TV myself from Hisense in Jhb. The screen has been removed and put back to clear the black spots but now has smear marks all over the inside of it. Can I please get someone to assist with this poor service!? I have driven 115 kilometres to collect this TV and now need to do it AGAIN!