Hisense - Shocking Service Delivery - Over a month without resolution on faulty washing machine

My Hisence washing machine is giving issues. I reported this to Hisense in the beginning of 2019, they sent a technician out and the issue was resolved, but only temporarily. The issue began again beginning of December 2019. A technician was dispatched on the 30th of December 2019. I was told on that same day, that he (Marius, the technician) would get back to me once he'd spoken to the service manager as this is the second time the same issue occurred. Marius advised that he would contact me on the 3rd of January. No phone call was received on the third of January 2020 as promised. Several follow ups were done with the service centre via email - Jurgen Smith has been the one replying to the follow ups. The same feedback being provided every time in that the technician is awaiting parts. I contacted Marius on Tuesday, the 4th of February 2020 and was asked to give him 10 minutes and he'd phone me back. Needless to say, I did not get a call back. I then again contacted Marius on the 6th of February 2020 to follow up. Only to be told that he deals with so many people, he often does not know with whom he is speaking. Marius further stated that he was informed that the spares would be available to him by yesterday afternoon and that he would call me on the 7th of February 2020 in the morning. I have not received a call. When trying to contact Marius to find out what is going on, my calls are now not answered. It is completely disrespectful and disgusting service delivery to allow a consumer to have to follow up for over a month. I am not asking for anything other than what is deserved. The washing machine takes up to 3 hours to perform what should be a 36 minute wash cycle. I am sure, in this day and age, with the load shedding and high cost of electricity, that you can empathise with why I would like this resolved sooner rather than later.