MIA Amazon books

I've ordered a lot of books from Amazon over the past…well…long time and never experienced a problem. Until now. I received an email on Monday October 18 saying my order had been shipped. Hasn't arrived yet. I sent an email yesterday morning, haven't heard anything back. Is it possible that all this time Amazon was getting us hooked in, and now they've switched the whole thing to some giant internet book scam? Nah…I'm going to go upstairs and see if maybe my books were delivered this afternoon. Wish me luck!