You're being emotional.
How could canceling your entire order for this title benefit your business in any way?
You may feel like you're "Sticking it to the man", but it's not improving your business at all.
Who knows who made the decision, or why, or what is happening behind the curtain. At the end of the day, that isn't for you to worry about. Your concern is if customers come in looking for this book, and get dejected because you straight up didn't order it. You could lose them to local competition, or even online competition, if they feel they need to go elsewhere to be assured they will find the books they seek.
Yeah, it sucks when you have been working on a deal for a while and it falls through.
But it happens all the time in business. The last thing you want to do is sour a relationship and potential future collaborations with a vendor.