The absolute worse customer service I have ever experienced in my life!!

We've been Layla Samsung fans for over 20 years and bought a new TV less than a year ago. It started switching itself off every now and then and as many as 3 x in a row. Logged a call via their online chat and the technician came out and re set it. It then happend again another 2 x after the technician came out and replaced the infrared unit on their 3rd call out. It's still switching itself off every now and then and twice since they've been. I logged another call, which was magically closed without the technician having been here and and I only realised this when they called to ask whether I've been happy with the last call out. I then spoke to Nhlanhla last week via chat and she assured me that it's been escalated and I requested that a manager call me. Nothing happened and Hope called me today to find out whether a technician has been and I told her no and also told her in no uncertain terms that Samsung will lose loyal clients if a senior manager doesn't call us within the hour in order to sort their shocking customer service and 'dropping the ball' moments. I also told her that I will review them on Hellopeter and FB if a manager doesn't call and sort this out once and for all. Well, Samsung, you're employees couldn't give a damn as reflected in the ever growing silence. You will replace this TV which you cannot seem to fix after 3 times and then hope that the customer goes away!!!