I could never get them on the phone but I've had good luck communicating with them via email:
animal.kingdom.lodge.itinerary.planning@disneyworld.com
For some reason a couple of spaces get inserted between the L and the D in "world" in the display of the (truncated) email address above. When you click on the link, the correct email address is displayed in the "To" field of the email message so it does work, it just looks odd as displayed above.
Be sure to include all your information in your email. I listed that it was a
DVC stay (so they would know where to look for it), the reservation confirmation number, dates of stay, my email address and phone number. Sometimes they emailed back, other times they called me.