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Hello Francois,
For queries related to billing create a service request they will contact you via email or call to resolve it. below are the steps.
1. Click link Contact Microsoft Support to navigate to support ticket page.
Type Billing.
In Contact Support, create support request
Fill in Problem description.
Click Next button in Recommended Solution.
In Additional details add your problem description and in File Upload containing the detailed screenshot of the error you are facing.
Click Review+Create and click Create button.
Your support ticket will be created and a mail will be sent.
You can track the support ticket in Azure portal using Help + Support, Recent Support tickets.
Hope this helps!, If you need assistance in creating ticket kindly let us know?
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