Legal Question in Employment Law in California

I see nothing in what you have written to suggest that you have a claim against your employer.

The large majority of employees in California are "at will." I assume that this designation applies to you. Under California law, "at will" employees may be discharged for any reason that is not against the law, or for no reason at all. The fact that an employer may have insufficiently investigated the basis of the termination, or failed to uncover the truth as to a situation, does not create a claim for wrongful termination.

Is there anything I can do?

The bottom line answer is no, other than present your 'defense' and try to persuade the company not to fire you.

Not only are there no laws against poor management or 'unfair treatment', but in general, unless an employee is civil service, in a union, or has a written employment contract, they are an 'at will' employee that can be disciplined or terminated any time for any reason, with or without �cause�, explanation or notice. Plus, complaints by customers/patients/clients would constitute 'good cause' for your termination, whether you disagree with the facts or not..