Faulty TV not credited at Dion wired

I bought a HiSense Smart TV for R7000, it was tested if it switches on/off, then taken back into the box, put on a trolley by shop assistant(2) took the lift while I took escalators to the car parking, they loaded inside my boot, I drove off, when I get home, try to switch it on, isn't working, called them, they said I should return it, I did, then when I was expecting to be given another working, was told by the Manager Gareth, that he's booking it for technician to assess it before I get credit on it, which I didn't as yet, 2 weeks later got a call from their repair department that, they not gonna credit me for it, cause there was a physical damage to it, but when I took it back we all checked it along him and the staff that we don't see stretch or any physical damage to it, now I bought a TV never watched not even a minute, money gone, no TV, nothing, warranty and guarantee or customer service doesn't apply