Credit Card Question

[Rebasxer]

So I bought DoD:S over steam on sunday using my visa card. I had fun playing it on Monday and Tuesday, and today I get a message from steam telling me that my credit card had been declined. How the hell does this happen. The card has a limit of 30,00$, and there might be 400$ currently charged to it. And besides, if you accidentally enter in bad info (typos in the number or such) doesn't it usually reject the card right away. I'm really pissed off, is this the companies (steam) fault or should I be worried that theres something wrong with the card?