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This article provides the detailed information on Cost model for Azure NetApp Files : Understanding the cost model for Azure NetApp Files helps you manage your expenses from the service.
Azure NetApp Files is billed on provisioned storage capacity, which is allocated by creating capacity pools. Capacity pools are billed monthly based on a set cost per allocated GiB per hour. Capacity pool allocation is measured hourly.
If you still find any difficulties please contact Billing/Subscription team would be the best to provide more insight and guidance on this scenario: It's a Free support has been provided
https://azure.microsoft.com/en-us/support/options/
Please let us know if you have any further queries. I’m happy to assist you further.
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