I am sorry to hear of your difficult situation and am working on your answer now.
CA is very strict but would not typically aid you in this situation I am afraid. While the company cannot forfeit vacation days typically since those are considered earned compensation, the same is not true for sick days.
Sick days are treated differently in that they are provided only when you are ill, may be forfeited, and are not earned compensation.
Therefore, you would typically have no legal recourse against the employer for this change in policy.
Good luck and take care.
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