Hi Greg,
The site you have visited is not a Authorized Autodesk Education Reseller so I would agree with the other post that you should contact your credit card company.
If you want to purchase a student version of a current release of AutoCAD you can find an authorized education reseller, here:
http://usa.autodesk.com/adsk/servlet/index?id=10916796&siteID=123112
If you are a full-time student, you can obtain free versions of many Autodesk applications, including AutoCAD, by registering for the Autodesk Education Community:
www.autodesk.com/edcommunity
Sorry for your troubles and best regards,
Matt
Matthew D. Allard
Senior Product Manager - Education Solutions
Worldwide Education
Autodesk, Inc.
100 Commercial Street
Manchester, NH 03101
Direct 603-621-3237
Mobile 603-502-0616
Fax 603-206-3679
AIM mattallard