Verbal Abuse from Ritco Plant Hire

On Monday 5th March while drive to work about 7:45am I was 1 car behind a truck carrying blue stones. The truck was not covered as well as the stones where overfull in this truck. The stones hit my Windscreen. I followed the truck through Tygervalley as the driver refused to stop. I finally got him to stop on Oak road and showed him my windscreen. we called the owner to report the incident and he was rude an vulgar. We then called the office and the lady asked for pics and a diagram. I was told that i must claim from insurance? Who is going to pay my excess. My windscreen needs to be replaced . What kind of sick world do we live in where people dont want to except their Faults. The driver S Mhlaba when I stopped him took a spade and was putting the loose stones back in the truck.