These kind of requests needs intervention on the backend by a support engineer.
All Azure customers have access to billing and subscription management support for free.
I would suggest you, please create an Azure Billing support request and work with the support engineer to understand the cost of the usage and share your feedback.
I hope support team will be able to assist you further and provide the needed guidance on this.
You can use the Azure pricing calculator to estimate the costs of using Azure OpenAI. More details here.
Also, please check the documentation to more about the provisioned throughputs.
Do let me know if that helps or have any other queries.
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