According to VAWA laws I am a derivative beneficiary of my mother's petition. We went for the interview last week and I was told that they would not grant me an interview because my mother's application only covered her. Why then did the NVC communicate with me for years sending me fee bills, notices and even sent me an interview letter? I believe the people at the embassy were not familiar with the type of petition we filed as the consular officer asked my mom to explain what it was. They gave my mother her visa. My question is what do I do to prove to them that they made a mistake? Or am I mistaken? Who do I contact and what steps do I take from here? Any suggestions or help are welcome. Thanks.