Legal Question in Business Law in California

If you have an actual written employment Contract, its terms may be enforceable. Without such Contract, you could make a claim for breach of oral agreement to overcome 'at will' status, and possibly for fraud in the inducement. Both require legal 'proof', including admissible credible testimony and documents, to win. The longer they had you work there, the less likely to win on fraud. Your lawyer might be able to use the threat of litigation as leverage to negotiate a reasonable settlement or severance agreement quickly, without you spending substantial money and time in a lawsuit. If serious about pursuing either option, feel free to contact me.

Employment in California is generally treated as "at will." That means either you or your employer can terminate. The limit on this is if you have a contract with your employer, or your employer terminates you for an illegal reason, such as race or sex.