Not at all, they had the option/right to state that that offer was not offered to you and doesn't apply, just as you had the option/right to move on a book with someone else.

The other way to look at it is that they are trying very hard to make you pay as much as possible - despite whatever claims they make as to having low prices, good service, fair business practices -> whatever the company uses to promote themselves...

If you were "threatening" then the company must have been trying to "trick", "take advantage", "overcharge", etc.. you by not offering you the promotion offered others.