I wish you'd write in English, not in some bizarre form of Code.
However from what you say, you appear to be being victimised. If you are in the Union already then might as well speak to your Rep.
Do not be bludgeoned into resigning - suggest to your manager that if he believes your performance is out of line with the general performance standards of supervisors in this matter, please can you discuss it with him/her. Ask you Union rep to accompany you at any meetings you have.
At the very worst (the very worst), even if there was evidence of misconduct on your part, this should result in the Written Warning, not dismissal for this first occasion. Dismissal for this (which implies Gross Misconduct on your part) seems not appropriate.
I trust your Union will say something similar.