Hello Pamela,
Thank you for reaching out to the Microsoft Community. My name is Arjay and I'm happy to assist you.
If you had just upgraded your storage or purchased a subscription, it may take a couple of hours to reflect on your account. Try checking your Storage by visiting the link below. You can refresh the page to check if the additional storage is visible.
https://onedrive.live.com/?v=managestorage
You can also check to make sure that your purchase went through by visiting the link below.
https://account.microsoft.com/billing/orders/
For additional help and information, kindly visit the support site below.
https://support.microsoft.com/office/8fca6272-3427-4cce-a437-2c5ed84550a9
It's important to note that when your mailbox is full, all incoming messages are bounced-back to their senders with a non-delivery report. In order to receive those emails again, you will need to request from your senders to re-send them.
I hope my information was helpful. Let me know if you need any further help.
Regards, Arjay O.