@Markw4 Let me see if I get this straight or if I am following correctly. Are you saying that Routledge gave you a preorder price, you paid for the book at the price that it was listed, and after you paid for the book they changed the price and asked you to pay the difference or something like that? If that is the case, is that even legal?
No. It was more like false advertising. Routledge said the book would be available for preorder at something like 20% off the regular price, but there was no way to preorder. They said preorders would be available at a later date, and the date was given by them. They changed the preorder date a few times, so I waited to get the 20% off offer. When I went back to see if I could finally preorder, the answer was yes, but only at full price.