Poor service from Digital Planet and HiSense

If I could score them lower, I would. We bought a smart TV through FNB on Black Friday. The TV was delivered on Monday 5 December and upon opening the box, we discovered the TV was damaged. On closer inspection of the packaging, we discovered that the box was damaged at the same place where the TV was damaged however the damage on the box was covered up by stickers from the courier. Now we are going back and forth, and no one seems willing to accept responsibility to replace the damaged TV. They are questioning our integrity by implying that we caused the damage when either removing the TV from the box or attempting to mount the unit on a bracket against the wall. We still have the damaged TV and no end in sight to this saga. At this stage, we just want to cancel the deal and have nothing to do with them ever again.