Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
If the upgrade happened recent enough, chat with billing support, explain it. They usually can help you.
Go to https://support.microsoft.com/contactus, Type "Billing" and press Enter. On the next screen, click "Contact support" at the bottom of the page, then choose "Microsoft 365" > "Manage my subscription". You’ll then see the option to chat with a Microsoft support agent who has access to your account to help review the issue.