I had to switch around my ressies today and I kept getting the same message. I just kept hitting the redial until I was able to get through. Just be patient, you will get through . Whatever you do, try not to call at the 7pm hour because that is when they are the busiest.
I called DVC for something this morning and their recording said dining ressies were unavailable due to the system being down today. If this would have been my ADR day I would have come unglued. As it was, I was on hold more than 15 minutes to check one thing.
I tried calling earlier today and received the msg and hung up. Did same thing a few minutes ago. Redialed and stayed on instead of hanging up and it put me through even though it stated all circuits were busy.
I received this message the first time I called and was able to get through around 6:30. Made my final ADR for the seating time I wanted so was definitely worth the extra try. Good luck everyone!