The employer has a legal duty to provide a safe workplace. Firing you in retaliation for safety complaints may be a violation of public policy if you can prove it.
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You need to speak to a plaintiff-side labor lawyer. There may be a retaliation claim here, but I cannot tell.
It is illegal in California to record a telephone call unless both parties consent to the recording. See California Penal Code § 632. If you complain about your employer's illegal conduct and your employer retaliates against you, then you MAY have a claim for wrongful discharge. It is not possible to tell if the other facts in your position add to your claim, give you an independent basis for a claim, or are simply not relevant.
There are many good lawyers on AVVO that practice in this field. I would contact one of them, or at least a plaintiff's lawyer in your area for a consultation.
Best of luck to you.