A Microsoft file hosting and synchronization service.
When did you perform the storage upgrade?
After payment there may be a delay of up to 48 hours for the new storage space to be updated.
If this deadline has passed, you can contact Microsoft support so they can help you with this problem.
On your computer, click the Start menu and type Get Help or go to https://support.microsoft.com/contactus
Enter "Billing" as keyword > Click the "Contact Support" button.
Select "Microsoft 365" > "Manage my subscription."
Then fill in a few more details and you'll be transferred to speak to an agent.