Assuming you are an at-will employee (without an employment contract or union membership), you can be terminated at any time for any reason. You can be terminated for making a personal call at work, you can be terminated early for putting in your two weeks notice. And your employer is not required to provide you with a warning or treat all employees the same when disciplining them.
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I am sorry, in the facts related here I do not see a claim that my firm would be able to assist you with.
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