Disclosure notices on websites, advertisements and in the terms of an agreement are often complicated and confusing. Companies understand this, and sometimes, they use this to take advantage of consumers. They figure that potential purchasers don’t have the time, inclination or knowledge of the legalese that goes along with the fine print. And, unfortunately for consumers, they’re correct.
https://www.billguard.com/blog/2013/03/grey-charges-are-upsetting-and-legal/