Ask your employer for a copy of the USCIS notice returning the petition. I cannot say whether you have "a case." If USCIS made a mistake, it certainly would not be a first. You may want to have the matter reviewed by your own immigration attorney.
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I agree with my colleague. You should request a copy of the rejection notice. Once receiving a copy of this notice, you should schedule a consultation with an experienced immigration attorney. Without reviewing this notice there is no way to assess what, if anything, can be done.
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