@Naziya Anjum Did you see any errors for the storage account not being fully created on Azure portal? Did you try deleting it using Azure CLI or PowerShell?
If none of this works, raising a support ticket is the recommended route.
To Raise a support Ticket:
- Go to the Azure Portal.
- Click on the Help + support option in the left-hand menu.
- Select New support request.
- Follow the prompts to create a support ticket explaining your issue.
Let me know in the comments if you need help with the support request creation or have any questions. I can help you with it. Thanks.