He didn't use a credit card but transferred the money directly to their bank account - plus they state that the money has to be there within 5 days. That's a very different story. It's reasonable (in fact, it's the only sane thing to do) to call before the 5 days are over and check if the transaction was successful. Sending a confirmation would be cheaper for them than handling all these calls. (I work for the customer service department of my company, and reducing the number of unnecessary calls is one of the main things you do in this job...)