No, there not gonna take $400.00 out of your bank account. they will tell you that you will need pay a deposit and get your ok and then they will ship your order.
Happened to me. I called right away when I found out and told the rep If it will affect me getting a later date she said no and I was wary but to my surprise she was right phone still came on the 21:). You should be good just make sure you ask who ever helps you