Cancellation notices are generally sent when credit card authorization fails. If you receive an order cancellation notice, please log in to your account https://ecommerce.randomhouse.com/account.do and make sure that that the bill to information matches the bill to information for your credit card.
If it's not an exact match, e.g., if the zip code is off, the credit card authorization will fail. If all the data is correct please contact your credit card company.
If you find the data provided is incorrect, fix the errors and reorder your titles from your shopping cart https://ecommerce.randomhouse.com/cart.do