DAMAGED 75INCH TV SCREEN SAME DAY BEFORE USING

I bought a Hisense 75TV this passed Friday, i transported the tv my self on bakkie, when i reached home i mounted the tv on the wall taking off the old one putting a new one from the box to the wall. the moment i switched the tv on it had internal crack on top just like on picture, no external cracks on the screen, physically its 100% . i laid complaint took it back manager told me that this kind of issue can only be resolved by headoffice. Okay i took the tv and laid complaint with headoffice via email and whatsapp. after a day this lady calls me, her name is Natasha says alot of things but mostly she is putting blame on me that i damaged the tv by using my own transport, she tells me how i damaged it by hitting a pothole. so i went to the store paid my money and never even used the tv for a minute, their reason of refunding me back or swapping the tv is becasue i used my own transport or i hit a pothole? wost part is that the lady called me but never even gave me a chance to talk very rude,unkind unfair customer service ever. Just after spending R11000 YOU GET ***AL Assistance.