Failure to call back and repair unit

The unit was \repaired\" at the end of March. When I tried using the unit it failed to work properly. I contact the call center a number of times only to get the response that they will contact me back which never took place. When I call into the call center today it stated that I requested that they call me back URGENTLY but it never happened. Now I have to make a booking so that the technician can come and look at the unit yet again. I haven't even be able to use the unit for 8 months and now they have to examine it yet again? This is not service. I will never recommend Samsung to anyone again. I have always been a Samsung fan but this matter changed my mind dramatically. "