Price changed once truck was loaded... Horrible service

I hired this person and his team to assist us in moving yesterday. I gave him an inventory list and he quoted me. We agreed that he would be at my premesis at 9am. He messaged to say that he was running late and that he would apply a discount based on this. They arrived at 11:50. Once the truck was packed, he changed his price as he said that he didn't expect that it would be that much. When we got to our new house, he refused to unpack until we paid. We paid the initial price that we agreed on and he tried to leave with our stuff. My boyfriend ended up getting into a physical fight with him while trying to stop him from leaving and he even threatened to pull a gun out. Eventually we paid the extra money because armed security was called and it was embarrassing. He proceeded to unpack all our stuff in the car park (even though we paid the inflated price) and left. The entire time he was unpacking, he was screaming and swearing so all our neighbors had come out to see what's happening. He also damaged alot of our stuff because they didn't care how they were offloading. What they did is really not right.

I would like to say that Mike kept saying that we expected a service for free but yet even after paying the inflated price he was still swearing and fighting so that everyone would know that they will not offload our stuff into the house because we wanted to rob them. He even made a point to stop the vehicle next to me and the agent before driving off and pointing at me and saying "don't you ever contact me again, you heard me". He said it twice because I just looked at him and didn't respond then he drove off