Have others call too!! I will prob. be a little flamed for this suggestion. Many think that is what ties up all the lines.
Our first trip- I had 5 different people calling. It was a little easier in those days, since no CC deposit. 3 of the 5 got a PS- I immediately cancelled the extra.
Now- my DH, and I both call on our cell phones, and first one thru books. It has worked the last 3 trips.
Good Luck.