Disgusted with Dion Wired Hyde Park

I purchased a Samsung TV on Saturday. They tested it at the store and the staff of Dion Wired repacked it and transported it to my car. We got home, assembled the stand and switched on the tv and there was a black line down the screen. We called the admin manager on duty Vincent who was rude and shouting at us. He insinuated that we damaged the tv. We informed him that they unpacked the tv initially and tested it and repacked it and loaded it onto a trolley. We returned to the store within an hour or so to return the tv and they insisted there is a crack on the screen. This was the second defective Samsung tv returned on the day. There was no physical crack on the surface of the screen. It is only when you switch the tv on that you could see the black line and an internal crack. Whilst we were there, Vincent was shouting at another customer on the phone whilst on the floor. Dion has come back to say that they cannot do anything about the tv. Disgusted and I will be contacted the consumer council and taking legal action.