At this moment you need anyone and everyone to be on your side. An adamant and recalcitrant authority can compound the damage.
You have already submitted some contradicting communications in writing. Let an expert lawyer examine all documents, evaluate the merits, and point out what is to be stated further, and what is to be kept in low tone/ high tone, and what is to accepted/rejected etc…
You may also approach seniors, leaders having in depth knowledge on how the system works in your company.
You must strategize and tread carefully, and proceed after astute planning in consultation with your lawyer so that the order of dismissal is called back.