When a CA employee is laid off or fired, they must receive their final wages immediately. If you were paid the night before, I don't know what else is owed from your question. If you submitted an expense report with mileage owed, they owe you that. If you are owed wages, call an employment law attorney to help you. An attorney can write a demand letter and get you wages owed, if any, plus one day's pay for each day you had to wait to get paid - up to 30 days PLUS pay your attorney. Filing a claim with the Labor Commissioner is an option, but one I don't recommend if you are owed wages and your former employer has money to pay you.
You have three years from the date each payment should have been made to file your claim with the DLSE.
Good luck to you.
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