Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
This forum is just a user to user forum, for account security and to protect users no-one here has any account access, you will need to contact Microsoft Support again, 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