PhD Dismissal after 6 years, how do I fight for it?

Thank you. My advisor is now retired. She is supportive of the situation, and she did help me through the first semester crisis. She is aware of my works and contributions; in fact she took my help in several of her projects. But after my appeal is rejected, I sensed she gave up too. None of the people who took this decision knows about me or supportive of my situation. The current department chair is not ready to stick their neck out to help me. I am currently a full-time teaching professor at another public university. I see at least three administrative errors:

  1. Letting me to continue to take courses after first year.
  2. Missing coursework from pre-covid times.
  3. Course auditor allowed me to form dissertation committee after passing the qualifying exams.
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