Arrogance of Bus driver

This am, I was on route on 1st ave Linden, in the right hand lane turning onto Bram Fischer. The Bus with reg HNY118GP was in the left hand lane which by the way is a non turning lane. as I approached the bus on the left, his hazards was on, leaving me to believe that he was stopping to pick up passengers. I then proceeded to head towards the intersection, when said driver started veering into my lane and basically pushing me into oncoming stationary traffic. I made my turn but he was basically 2cm away from me, cutting the vehicle behind me off. Whilst turning i blew my horn ensuring that he knew of my presence. At the next traffic light in Bram Fischer, i watched him and his passengers having a good laugh at what just happened. he then nonchalantly looked a t me and flipped me a middle finger. passing these lights he then once again came at me from the left trying to push me into oncoming traffic. I think this utterly rude and basically used his vehicle as a weapon as the car I drive is no match for his vehicle. I would like feedback from Metrobus on this incident and demand an apology from the driver.