FYI, I submitted mine on 9/3 for a cruise on 10/1, received the confirmation email but didn't get a reply or show additional OBC up to this morning. I called Carnival and connected to the extension for existing cruise bookings and got a rep to look into it. I gave them the incident number from the auto reply confirmation email and they got it credited to me in about 10 minutes.
You should give them a call since it appears the rep can contact the right department and get that processed right away.
