My experience and what I have read elsewhere is that this kind of situation is not about what you or anyone else 'deserves'.

HR is there to protect the company, not to protect any individual employee.

Also it helps to clarify in your own mind what is your primary goal right now and act accordingly. If it is to keep your job until you find another one, or if it is to convince your CEO that you are in the right and your boss is in the wrong... or something else. Those are all very different goals and have different demands.