How to delete old Blueyonder email addresses

Hello,

It has been some years since I left Virgin Media.  I closed my account at the time so am unable to log in.  Also, I no longer use the @blueyonder email accounts (mine and my husband).  However, the email accounts still appear to be active as we have received messages forwarded to our new email accounts.  How can I get the old email addresses deleted as I am having difficulty contacting Virgin Media directly due to not having an account?  Thanks.