Hit and run right in front of me!

So every week morning I make the trip from Brackenhurst to Booysens Overton and back to drop my wife off at work and this morning just after dropping her off I stopped at a red traffic next to Danmar Auto Body and this silver i10 blows past me in the right lane through the red light, not slowing down or anything... Next traffic light which is c/o Booysens rd and Heronmere Rd this i10 is wanting to turn right, robot goes green and he pulls into the intersection, instead of being patient for our green turning arrow he guns it cutting off a big truck and hits a lady pedestrian to the ground and speeds off! I also going the same direction caught up to him on Klipriver and told this male in his 20's how much of a piece of shit he really is, he said he has some home emergency yet continued to drive normally all the way until he turned off into Brackendowns where I carried on....All this happend around 7:10am this morning.

What is the best way to report a hit and run?