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Someone in your situation has three options:
1) To negotiate privately (that is to email them what you were thinking along with a demand, etc). If this fails - and likely it will - then one has the following:
2) File a wage claim through the California Dept. of Industrial Relations. See HERE. This is an administrative process through the state and they can either agree to pay, or will force an administrative hearing to determine if there is outstanding wage to be paid; OR
3) File in court. This is a judicial process and is essentially a lawsuit.
Because the administrative process in #2 was designed especially for this, most ex employees prefer it over anything else and it normally succeed if the wage is indeed owed.
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