Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
When did you upgrade your storage?
After payment, there may be a delay of up to 48 hours for the new storage space to be updated.
If that time has already passed, you can contact Microsoft Support for assistance with this issue.
On your computer, click the Start menu and type "Get Help," or visit https://support.microsoft.com/contactus
Enter "Purchase" as the keyword > Click the "Contact Support" button.
Select "Microsoft 365" > "Manage my subscription."
Then, provide a few more details, and you will be connected to an agent.