Berkeley Investment Group only does one check - a correct CVC. But alas, some banks freak out.
Banks primarily decline cards for two reasons: you're past your limit or risk control parameters.
Important risk parameters include: expiration date and cvc. Giving you the benefit of the doubt, you got it right, right?
Complicating things, some card-brands are wary of third-party purchases, but clicking "Remember Me" and adding a cell number can help. Try that: here
If you're still getting this page, that sucks - for both of us. Shoot me an email: sanjeevsuresh AT berkeley.edu