Rude suppliers used by Miway for Home Assist

Never in my life has anybody been as rude to me as Bongani, a Miway assigned plumber. He came to my mom's house to clear my mom's blocked drain, and he was quite friendly at the start. He was extremely rough with his equipment, as he was dragging the plumping wires very fast against the metal paint of the gate and over the items that were standing in his way, and I had to tell him he needs to not be so rough as he is doing damage. He kept on rushing and disregarding my comments, but at least remained friendly and went through all the access points like I asked him to. I then also had a general conversation with him whilst he was packing up, where I told him I usually put drain acid down the main drain and that this dissolves the roots completely. He then started cutting me off telling me that drain acid will never dissolve roots so who ever told me that is wrong. I then mentioned that root are organic and acid dissolves organic matter, as it even says on the bottle. He again cut me off and told me it is wrong. I left it at that. But then as he left I told him I'd like to take down his number as I like to work with the same plumber who knows my mother's house next time, but I told him that he should please be more gentle next time and to not cut my off when I give an opinion as it made me feel uncomfortable. He then suddenly turned very rude and told me I should not save his number as he refuses to work with me. He raised his voice at me and started reversing toward the gate as if in a rush to get out, even though the gate was still closed. I then told him I would report him and that I would ask miway to remove him from their panel simply due to his sudden rudeness to me as no client should be subjected to this. Not at any stage did I shout at him. He then laughed loudly at me and told me "good luck because Miway will never remove him from their panel"... I then told him that I know the Miway team very well and know that they, incliding the CEO would noty stand for such rudeness. He proceeded to say "never never never will miway remove from from their panel, you are welcome to try and I promise you, you will fail"... I was very heart broken to be treated like this - he completely took my power as a Miway client away. He represents the Miway name and I'm used to only caring friendly service. I hope that this complaint will receive urgent attention. I am not sure what power Bongani has over Miway that he believes he can treat me like this and know with confidence that Miway will never remove him from their panel. Could you explain this to me? Is Bonagni more value then the Miway client? What let's him to believe this? Perhaps a client complaint about him before and he has been getting away with this and feels he has the right to talk to a Miway client this way? He treated me like dirt and made my feel worthless. Like so many people, my family and I had a really rough year emotionally and didn't need to be torn apart like this by a fellow man. He made my feel like I am not deserving of respect.