Hmmm, I would call again and ask to speak with a guest services manager if they give you the run around. I think you just got a dud on the phone. Knew a guy who did it well in advance and did it at the MK. It was extremely well done and they knew what to do from he moment they arrived for Dinner at the round table. I was very impressed. If there is one thing that Disney still does better than everyone it's holding themselves to a higher level on customer service and satisfaction.
If you get the run around again, post it here and we will figure this out.