If it is just to add the Hopper to your existing tickets, why call the DVC line? Not trying to be a smart aleck, but I would call the 'regular' line and go through them. Also, is it possible to 'upgrade' to the Hopper through the MDE app? I don't know...just throwing that out there.

BTW -- Wasn't yesterday the last day for the '2 free park days' offer? If so, the phone lines were probably jammed up with 'last minute' callers.