Dangerous driving with illegal plate at the back! ...

Dangerous driving with illegal plate at the back! I was driving nicely on 05/01/19 down Sth mway and this truck tailgate me 3 times and horned me! This was so dangerous! I wasn't slow as the mway is always busy. I then let him passed me and there was a kid sitting on the pax seat looking back at me. This truck finally went off ramp on Mill road. I couldn't get anything on this blurry plate and it looks illegal. Mainfreight you let such a lunatic driver to drive your truck you are the criminals!