Disgusting behaviour and workmanship from owner

We paid almost 10k to have a Jeep head fixed (welded). They kept making empty promises that it will be done the next day, every day for 2 weeks. Owner does not answer his phone EVER! Finally, upon collection, noticed that they had done such a bad job, my 7 year old could have literally done a better job! When the concern was brought to his attention, he started shouting and insulting me, saying that I opted for the cheap route (which, by the way, was recommended by HIM) instead of replacing the whole head! He claims it's the cheap route, because 10K is what he gives his kids for tuckshop. Clearly he doesn't need the business then. He came right up in my face that our noses were almost touching, trying to intimidate me and then told his wife to refund me because he is keeping my cylinder head, at which point I told him not to. This is the most disgusting "service" I have ever received and I will tell everybody about this disgusting excuse of a human who is so common! I will most definitely be taking this further. This man should NOT be running a business, surprised it's still around!