I was going to say:
You actually clicked over the early saver deadline. Early Saver requires a five month advanced booking. If you checked on August 24th for a December 24th you were right on the deadline. When you called back on the 25th you had passed the deadline.
Then I realized the Christmas is only four months away!
I'm guessing your original rep did not look up the fares, but just thought the Early Saver was still in place. Their mistake and you have to pay for it - bummer. They certainly should have done a better job, maybe even holding the cabins at the quoted rate. Of course then they should have realized their error.
With a group that size don't you get one free fare?
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015