With the number of people ordering on Amazon a scammer can safely assume a vast number of people will fall for their trick. Never click links in e-mails concerning problems with your accounts. Always login to the website directly by opening them in your web browser and using your own bookmarks or typing the address in.
Scammers send an e-mail to you that indicates a problem with your order, the link takes you to an Amazon look alike site. Asks you to login with your amazon information and then for you to update your credit card information. After it is entered, it just spits you out to Amazon.com and you were just scammed.