SD+ Old Support Group In Views

I recently renamed an old support group to *disabled*SuppportGroupName
(as it appears you cannot delete old support groups)

and then removed all the "Technicians interested in this group" and left only an "admin" Technician listed.

However, previous technicians who were part of this support group can still see the group, in its old name, listed under their Views available form the Requests tab.

If they choose the old name, it displays a request page with no results (as im assuming the rename means there would be no more calls associated to the old name)

I have tried removing all associated groups for the technician and it is still listed.
I have also tried clearing all local cache/cookies etc of the users machine

Has anyone seen this before, or are they aware of a fix or workaround?
Thanks