I just received this email from Amazon on Thursday afternoon, this may be related:
"We are notifying you that we incorrectly issued an early invoice for your September AWS usage on September 18th. As your card was charged successfully for this invoice, we are currently processing a refund for the unexpected charge. The refund generally takes 3-5 business days to be received by your bank and some banks may require additional processing time. Your full monthly usage will be invoiced through our normal billing process on or around the 3rd of October. We will send another notification when your correct September invoice is available. We apologize for any inconvenience caused by this error.
There is no action required from you, but if you have any questions, please contact the AWS Customer Service Team by visiting: https://aws.amazon.com/support, and opening a case by selecting 'Create Case'. You can then select ‘Account and Billing Support’ , followed by ’Billing’ for the Service, and ‘Charge Inquiry’ for the Category."
"We are notifying you that we incorrectly issued an early invoice for your September AWS usage on September 18th. As your card was charged successfully for this invoice, we are currently processing a refund for the unexpected charge. The refund generally takes 3-5 business days to be received by your bank and some banks may require additional processing time. Your full monthly usage will be invoiced through our normal billing process on or around the 3rd of October. We will send another notification when your correct September invoice is available. We apologize for any inconvenience caused by this error.
There is no action required from you, but if you have any questions, please contact the AWS Customer Service Team by visiting: https://aws.amazon.com/support, and opening a case by selecting 'Create Case'. You can then select ‘Account and Billing Support’ , followed by ’Billing’ for the Service, and ‘Charge Inquiry’ for the Category."