They were told, as they moved up the managerial ladder at the call center, that the amount they had sent in was much larger than their normal monthly payment. And if the increase hits a certain percentage higher than that normal payment, Homeland Security has to be notified. And the money doesn't move until the threat alert is lifted.
Eventually, his and his wife's money was freed up. The Soehnges were apparently found not to be promoting global terrorism under the guise of paying a credit-card bill. They never did learn how a large credit card payment can pose a security threat.