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Hey there, PAVITHRAN MATHURAVIRAN
You will need to submit a support ticket to the billing team on Azure support. Please can you sign into your account on the help & support blade here: https://portal.azure.com/#blade/Microsoft_Azure_Support/HelpAndSupportBlade
Once you have signed into your account, please can you create a support request. You will need to provide a description on the problem you are facing. I would keep it short with something like "Accidental charge. Refund request". Then please select billing and choose the subscription the resources were created on.
You will want to scroll to the bottom and choose contact support then create a support request.
This will allow you to reach the Azure billing team who can look into the charges and explore available options for you.
Hope this helps,
Nathan