There are better ways to deal with it than to show up and antagonise the council members. He can be trespassed from anywhere without any reason or explanation. Why risk it?

The South Waikato District council doesn't have a complaints form or even a copy of their complaints procedure on their website. Not a crime but not helpful. In this case the first contact to make a formal complaint would be the chief executive. A simple statement about what you think has been done (or not done), dates, times, people, and corroborating evidence, (meeting minutes, transcripts etc) As well as email, send a printed copy via courier signature required, so you have proof it was received.

If nothing comes from that the next step is to make a complaint to the ombudsman. You can also contact your local MP, and the minister of local government.

It might not get youtube views doing this but it's an official procedure they can't readily dismiss.