New Zealand Law
Have New Zealand Law Questions? Ask a Lawyer Online.
This is a matter which should be at the worst a warning if the principal uphold the complaint. The issue is whether this was appropriate to say to her, and if any bad language was used by you. But if she had done something which needed discussion with you, and was something where you thought she was in the wrong, then if the conversation was just about that issue, you should not be warned or dismissed. If you are warned or dismissed then you can claim a personal grievance
You should be allowed a support person, and the union may be able to help with this.