Specialty Technical Publishers

Has anyone else has run into these scumbags? Sometime last winter I received a call along the lines of "We'd like to send you some materials to review". Well, they sent some "Internet Law encyclopedia" along with an invoice for ~$700. Of course, there was no cost mentioned in the sales call- for all I knew they were going to send me a brochure about their product. I can say with 100% certainty that I would never have authorized them to send me something like this had they mentioned the cost without much further discussion as to what I was receiving. This is just a general heads-up to a sleazy business practice for a sleazy company that is now attempting to extort money.