Hi,
First, have you changed the SKU of your Azure SQL Database so that you will avoid future higher than expected charges? If you tell me what your current SKU is I can recommend what you should consider changing to. For example, if you are on Serverless you might consider changing to DTU or Provisioned for a more consistent monthly charge.
Second, you may create a billing support request so that you can speak to a billing engineer. You can explain to them what happened and ask for a refund. Billing support is free.
Please carefully follow my instructions below to create new billing support request without getting stuck in endless loop.
I you have issues creating ticket please let me know in a comment.
1. Navigate to this link to start the process:
https://portal.azure.com/#create/Microsoft.Support
2. Enter billing in the box and click Go
3. Select Billing and click Next
4. Select your subscription from the dropdown and click Next
5. At this point there will be a delay of several seconds, and then various options will be displayed. Click Create a support request button at the top. DO NOT CLICK any of the other options.
6. Fill out screen, Summary, Problem type, Problem subtype, then click Next button at bottom. You may need to select different Problem/subtype than shown below
7. There will be another several second delay, and then some solutions will be displayed (this is similar to above). DO NOT CLICK any of the solutions, instead click on Return to support request button in upper left corner, similar to below
8. Now you are back at support case. Click Next button at bottom to continue to Additional details tab. Fill out information as required, one of the items you may need is your Subscription ID.
You can open separate browser tab and navigate to your subscription in portal, the ID is there, click the copy button to the right of it, then paste it into the box on Additional details tab. Click Next to advance to Review + create tab, then click Create.
You should receive an automated email within a few minutes and then be contacted by support within 1 business day.
Please click Accept Answer and upvote if the above was helpful.
Thanks.
-TP