Pick n Pay - Reckless truck driver

Good day, one of your trucks with 3x people inside the cab almost drove me off the road - this was intentionally as he flashed his head lights, moved to the right lane and continued to try and push me off the road. I was fortunate that there was a yellow line and eventually an off ramp... Truck/ horse number TG 0048
Occupants two males and one female
Location N1 north Shell service station
Date 2012-08-05
Time 18h02

Kindly assist how I should proceed, he is an intentional danger to the rest of the road users