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Hey there, AKJ Academy
As soon as I noticed the issue, I immediately cancelled the subscription, started deleting the resources, and submitted a refund request through the Azure portal with the reason "Forgot to cancel subscription."
As you have reached out to Azure support already through the portal, you have already done the right thing. The billing team will respond to you and let you know if your refund request is authorised. If you wish to speak to someone from the billing support team about this, please can you create a support request through the portal here: https://portal.azure.com/#blade/Microsoft_Azure_Support/HelpAndSupportBlade
Once you have signed in, pleas click onto create a support ticket on the top navigation
Please describe your issue you are facing and select billing and a subscription that the resource was attached to where you got these charges from.
Please scroll down until you come to a section 'Need more help?'
Once you get to this section, please click onto 'Contact support'
Then click onto 'Create a support request'
This will allow you to to submit a request to the billing team who will respond to you via email. The billing team are good at responding and trying their best to help you with your question.
Hope this helps,
Nathan