You did not do anything wrong. It is just because that DH needs some time to approve new accounts. It seems they are careful with credit card fraud. That's why DH prefers Google Checkout.
However, if you feel you have waited too long, don't hesitate to send them a ticket via DH panel --> Support --> Contact Support. If you feel you have waited tooooooooo long to get a reply, set the type of ticket as OMG EXTREMELY CRITICAL EMERGENCY
we are all customers. we know how it feels to wait for it to be approved AFTER payment.
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