Technicians cant repair a machine just out of warranty after 6+ attempts, Samsung distance themselves

In may 2017, 2 months after a top of the range tumble dryer went out of warranty, a filter light came on and the machine stops mi cycle. I bought this machine through Hirschs so I called the service department. In June 2017 paid the R513 call out fee only to be told the machine is fine. The machine continued to give the same error and the technician came out again. He claimed it was fine an that the sensor was just dirty. The same problem continued intermittently! In December 2017 I called again and was charged an additional R550 for a call out for the EXACT SAME PROBLEM. The technician ho attended this call out told me that the previous technician was an idiot and no longer worked at Hirschs. He identified that the problem was the sensors needed replacement. I disputed the charge for the 2nd call out to attend the same technical problem but this was declined and rather Mr. Allan Hirsch offered me the sensors at cost - R158 for 2 sensors that are obviously made from plated 9ct gold. - The same problem continued after installing the sensors, diagnosed by a samsung technician. I called Hirschs service centre again and it took 3 weeks for the team to arrange the technician to come out again. When he eventually did, I was told it is the pump and was presented with a R950 quotation. Having learned my leson, I asked for a guarantee, in writing, that should this not fix the problem, I would be refunded my money. I received the guarantee in writing. THE SAME PROBLEM continued after the pump was replaced. It is clearly evident that the technician/s sent out to repair the machine have no idea what is wrong with it and are replacing items as they go, however, this is at my expense! I have proposed that the 2nd call out fee as well as the spares charges are refunded to me and rather put toward a new machine. I suggested that Samsung offer a discount on a new machine that I would be happy to procure through Hirschs again. The 1st call out fee I have no problem to forego. Samsungs response to me is that they have nothing to do with Hirschs call out and further to that, as the machine was out of warranty they will not offer a discount on a new machine. They further state they cannot sell directly - this was never asked of them??? What a poor attitude Samsung, as stated in my response to you email, I will get my spares money back from Hirschs however I will buy a brand from a more reputable manufacturer who actually stands behind their products! The machine was an 8kg top of the range machine that I paid R7,200 for in 2014 - by your response to me, you dont believe there is anything wrong with a machine lasting 3 years and 1 month? Pathetic! I did everything possible to repair the machine but after spending well over R2,000 on the same issue that was never fixed, I finally call it quits.