Ashburton,
Since you have the copper's details on the summon, try calling up a lawyer or something. Make that a chinese or indian lawyer. Check out what are the procedures that you need to go through. Gather as much evidence as you can, like your tinted glass can't be seen through and such. Take photos and print it out to A4 size to be used as evidence. Make sure the evidence is good.
Try this.
- take a photo of your car at about 4-5 meters away. ensure that the photo is taken under the same lighting condition as when you got the summon from the cop. For example, if it's 12:45pm and sunny weather that you first got the summon, then take a photo of your car at the same time. Ensure that nobody is inside your car when you take the photo
- take a second photo but this time, with someone inside your car, wearing the same color shirt as what you wore when you first got the summon.
- print it in A4 size, color.
This will be the evidence that the cops can't see through your tinting even from however far they are.
Then, file a report of abuse of power / extortion against that police, saying exactly what happened to you on the day of the incident, in the report. Get a copy of that report.
Call up The Star and a few other local newspapers. Make a newspaper report on this abuse of power/extortion case. Then bring everything to the court.
Good luck and God bless. Pray to God and believe that He will set the crooked straight again.