Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
You mention upgrading, did you upgrade from either Microsoft 365 Personal or Family to the Premium version?
If so, when you upgrade your version of Microsoft 365 to a version with more features, what happens is the remaining time on the previous subscription is added to the new Premium subscription on a percentage basis.
Log into your Microsoft account on this link (https://account.microsoft.com/services/) and check if the expiry date is March 2027 or 2028.
If that is listed as March 2027, this forum is just a user to user forum, no-one here has any account access, you will need to contact Microsoft Support directly, try using this method to contact their support.
Go to this link: https://support.microsoft.com/contactus
Select Microsoft 365
Click 'Get Home Support'.
In the box provided, type billing.
Press Enter, then on the next page, scroll down and click 'Sign in to Contact Support'.
Navigate to Microsoft 365 and Office - Manage my Subscription.
Select the 'Chat with support agent in web browser' option