Please help with not being able to receive emails due to "over user quota". I emptied folder, but it's still not working!

I need emergency assistance with email. I received error message on one of my (most important) email accounts that 100% capacity was reached. I erased a ton of emails, making sure the largest attachments get erased. I cleared the trash bin. I waited 24 hours. Still, I cannot receive any emails. When I tried sending a test email to myself from another address, this is the error I get : “Message could not be sent. Error message from mail transport server: 452 - 452 4.1.1 <c… [Edited: "Personal Information"]> user over quota”.  I am using a desktop, Xfinity website directly.  I can send emails from that account, but not receive. Please help I really need those emails! I called customer service, but ended up with a support ticket, which might take forever.