@Hamza IMO, your best bet would be to contact Azure billing team by raising a support ticket. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.
Here is the link - https://docs.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.
FYI: Azure Billing and Subscription Management support is included in the Basic Support Plan without any charge.
https://azure.microsoft.com/en-us/support/plans/
EDIT:
Can you follow the instructions from this post - https://learn.microsoft.com/en-us/answers/questions/1423494/azure-portal-refund-request-doesnt-work-it-shows-a to file a refund and let us know how it goes.
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