Miscellaneous topics that do not fit into specific categories.
I can see that you already have a support case. Since a case has been created, the best course of action is to follow up with Microsoft Support using that case number. They are the only team that can review the charge, cancel the subscription if eligible, and determine whether a refund can be issued.
Have you received any emails from Microsoft regarding the case?
Is the Visual Studio subscription showing as active in https://account.microsoft.com/services?