They told me sorry nothing we can do we don't know why it was canceled could be any of these reasons. So you'll just have to reorder
The same thing happened to me. I went to iStock website and found my phone at an Apple Store two hours away. Upgraded one of the seven line we have. Used the same credit card, Apple had no problems. And I did an in store pickup and had my phone that day. I will never pre order from ATT again.