Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
This forum is just a user to user forum, no-ne here can continue your support request, you would need to contact Microsoft support again, quoting your support number.
In the meantime, please provide full details on the problems you are experiencing using the Microsoft 365 software, also are you using the Office suite on a Windows PC or Apple Mac computer, and please provide a screenshot of any error you may be seeing,