Bad service/Misleading specifications on the box

I bought a 100 Hz Led TV at House and Home, Tyger Valley in December 2011. Just after a year, a black spot appear on the top left side of the screen. I took it back to them and they told me to take it to Liptronic in Parow (job no 165203) 02.01.2013. They repaired it by fitting a new screen. After another year the same problem occurred (Feb 2014). I phoned them to complain about the problem. They informed me that the TV''s warranty was not valid anymore and that I was responsible for the cost of the replacement. I should not be liable for the cost of the repair! This is the exact same problem again. Now after a year, I inspected the backside of the TV again to find the specs and job number for reverence. I then discovered that I haven't received the 100Hz to begin with. It should have been a 100Hz but yet the actual tv is only a 50Hz. I have also escalated this problem to Samsung SA and to date I still don't have any feedback on the repair work needed for the second time, as well as the tv that differs from the specifications on the box.