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I am sorry to hear about this situation. You are not going to like my answer, I am afraid. Thanks in advance for not shooting the messenger.
Unless the employer and and the employee have a contract that mandates specific bonuses, cost of living, etc, the employer does not have to give them out. I am going to assume that there is no such contract. Barring that, unless someone in your situation can make a successful claim that these bonuses, etc, are being given out on basis of race, religion, creed, etc (basically, a discriminatory decision), then there is no case as the employer has no mandate to give them out anyhow. If they do, it goes by the employer's arbitrary decision regardless of how long someone has been there, for example. I am sorry.
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