Unknown Provisioning Service Error :(

Hello,

Can someone please help me with this issue; When I try to add a previous email address as the primary that was tied into my previous account (which now has been closed) I'm getting the "Unknown Provisioning Service Error".  I been on the phone with Comcast at least 8 times and no one can seem to find a way to correct the issue.  Seems like the user name is still tied into the previous account which has been closed.  How can I get my email address back?