Approved LC. Different Legal entity within the same company


My company has an approved LC whose job description matches mine (qualifications etc..), but I work for a different legal entity with the same organization that what the company claims.

Here is the exact scenario. I work for ABC. The LC was for ABC. My tax statement (W-2) states that my employer is "ABC, Agent for XYZ". Even the employer ID in W-2 matches the one in approved LC. Now, the legal dept. claims that although my employer is ABC, my legal entity is XYZ. So, they claim that they can\'t file my GC with substition argument. Is it a valid claim? How can they help me in this case in using the approved LC?

Please advise!!!!!