please help with police harrasment incident

[EA Bogan]

on the wednesday night i was on my way home from work and approached the newton rd/gorge rd. intersection. A light blue early 1990s model Mitsubishi Lancer was approaching the traffic lights whilst driving in front of me. The driver brought down their speed to less than 40 km/h in a clearly marked 60 zone that is a main road. The Lancer was proceeding past the traffic lights and was not braking, he was either using the engine to brake or simply did not accelerate and reduced his speed by coasting. I was travelling at the speed limit behind the lancer, and drew closer to it as the driver inexplicably reduced speed. Not wanting to run a red light, i cauciously pulled out ahead of the lancer, and proceeded to accelerate back up to the limit to overtake him, past the lights, thereby avoiding this driver who was a clear hazard on the roads

I had turned into Hancock rd. when a police Ute pulled me over. I exited my car, walked up to the police Ute greeting the officer in a friendly and courteous manner, stating "what can i help you with mate?" The policeman appeared agitated and said he saw me speeding. I was not aware of any offenses that i had committed and so naturally i was puzzled at his claims. He also claims i was following a car too closely and that i should not lie to him. I remained calm and stated that i did not wish to lie to him, and attempted to explain the situation to him, that the car had decreased its speed and i merely changed lanes to avert an incident leading up to a red light. He spoke to me in an aggressive and threatening tone, stating that "if i talk to him like that he will search my vehicle and take it apart"

I felt threatened by him and did not argue, i was polite and co-operative throughout the incident. He said he would give me a warning for the speeding, but would write me up for following the vehicle too closely. He did NOT give me a copy of the expiation notice, and told me it would be mailed out to me when i approached him in the car as he was about to drive off, to check with him. He my have believed i was speeding because i overtook the Lancer at about 20 km/h faster than it was traveling, though the Lancer itself was traveling at not even 40 km/h, as i was gaining on him slightly with my speedometer pointed at 40 km/h as i was reducing my speed in response to his erratic driving. I had no intent to break any road rules, and took the safest and most efficient course of action by changing lanes to avoid this driver, who was himself committing an offense of driving far below the posted limit on a busy main road for no reason.

I had not signed anything stating that i have been booked for this offense, he did not tell me what speed i was traveling at (im nearly completely certain i had not exceeded 60, the traffic light camera would have caught me as i passed it if i had)

Is there anything i can do to challenge this offense? I assume the courts would never believe my story over the two police officers, but i do not wish to be the victim of this arrogant harassment and wrongful offense.

I would really appreciate any advice on this matter.