Hi Adrian and welcome to the QnA community forums
my Azure SQL pricing tier suddenly changed on May 9 to a more expensive version
As much as I noticed every time that a price changed Microsoft sent an email to inform the relevant users about the change a long time before it is implemented. Check your email and confirm that you white list the announcement from the Azure so it will not find the way to the spam folder.
I first went to the first day that the pricing started to report higher on the Cost Management section, and then went to the SQL server to find out what changed. There was a SQL Database, but the Event Initiated By column was empty.
Since we cannot read minds (at least I can't) and we cannot see what you describe, then it is a good idea to provide a screenshot to make it clear what you get/see :-)
There is a smart sentence saying
one picture worth a thousand words
Trying to understand who/what changed this configuration.
This is a community forum and not a support ticket system. We can help on technical issues but we cannot examine your specific subscription.
But no worry. This issue related to Billing and support for billing questions is free by the azure team - no need for support plan to get this.
Therefore, I recommend you close this thread and open a support ticket from your azure subscription using the Azure Portal and make sure that you select "Billing" for the category. The Azure team will be able to check your specific subscription and provide insights
In the meantime, you can try to Track the Changes in the Service Pricing Tier using the
Azure Activity Log. My guess is that if you did not get any email about changes in the price then you did some change in the pricing tier of your service. This information can be tracked in most cases using the Azure Activity Log. You can learn a bit more about the Azure Activity Log in this link.