3 years ago, I had a similiar experience with NCL. The price quoted by the NCL rep, when making a change on a cruise during the call was not what my invoice stated. They forgot to include the FAS charges after specifically responding to my question during the call that they were included. I called back and asked to speak with a supervisor. The supervisor returned my call and after explaining the situation, he was able to review the conversation (all calls are recorded). It took several days but I did indeed receive a phone call back and the correct price that was originally quoted to me was granted. Perhaps try this route? Good luck and enjoy your cruise regardless of the outcome!