Terrible service

About a year and a half ago we bought two Chanson Miracle Max Royale water ionizers (These are +-R 44 000 per unit). A while back the one machine started acting up. Sometimes when you touched the screen, it would turn on, but then started cycling between the home screen and settings. Nothing you did would stop it from doing that. The only way to stop it was to unplug the power for a few seconds and then plug it back in. Then it would work normally again. So I contacted the seller. They left a message with their supplier to contact us so that we could service the device. You never phoned us. So I spoke to the seller again and insisted on contacting the supplier (You - Designer Water in Centurion) myself. I phoned several times over a two week period, before someone actually answered the phone. I explained the situation and was told to bring the device in. I arrive at the front door, with several people sitting and chatting. Eventually someone decides to get and and help me. The very first thing they say to me is "SANITIZE" (and then walks away). That seems a little rude, but ok. I sanitize, take my temperature and sign your little sheet. I explain the problem, which seems too complicated to understand, so they call the technician. I explain the problem to him. He doesn't seem to know where to start, so I suggest that he flash the firmware and maybe check for newer versions of the software and hand the device over. This was in December 2020. I was told you would update me before you closed for the year. That didn't happen. So I phoned you in January, at which point that person didn't know the status of the job, but they would get the technician to call me. That didn't happen either. A week later I decide to come to your shop. I get there, sanitize, take my temperature and sign your little sheet. People are sitting and chatting as usual. Several look in my direction and then look away and carry on chatting. Eventually one person get up to help me. He doesn't know the status of the job and calls the manager. He doesn't know anything either and calls the technician. I ask the technician about the status of the job. He then explains to me how he was trying to fix a problem I did not have. He clearly doesn't know what he needs to be doing, so I describe the problem to him again. I ask him what he has done in all this time. He reset the factory defaults. I could have done that (in 2 minutes), yet it took him weeks. Visible upset, I ask him to look into the actual problem and update me asap. This was 26 January. He promises to update me by 28 January. Today is 18 February. More than three weeks later and still no update. Is this the kind of service you get after spending R 88 000? Your service is absolutely terrible! The worst I have seen in a very long time. So now... please explain to me what I need to do to get this situation resolved?