Hi Jon,
I recommend you create a new Billing support request through the Azure portal. There is no charge for subscription/billing issues. This way you can discuss what happened with a support engineer and ask about potential remedies.
Please create a new billing support request using my instructions below. The process can be confusing so if you have difficulty add a comment below.
Use this link to start the process:
https://portal.azure.com/#view/Microsoft_Azure_CostManagement/Menu/~/support/openedBy/AzurePortal
Fill out Summary, Problem type, Problem subtype, click Next. There will be a delay, then some recommended solutions will be shown. Do not click on any of the recommended options shown.
In the upper left corner, click Return to support request
Click Next to move to Additional details tab, fill out required information, email/phone, etc., click Next, review details and submit case. After submitting you should receive an automated email within a few minutes and a support engineer should contact you within 1 business day.
Please click Accept Answer and upvote if the above was helpful.
Thanks.
-TP