No messaging supervision

We have Norton Family Premier.  For some reason the messaging supervision is just not coming up as an option for us.  Every time I receive the weekly or monthly summary email, it says "Messaging supervision: Off".  I have been through the help files which describe exactly what to do to turn messaging supervision on, only it seems that the required tab is simply missing from our online interface.  

If the feature was not enabled then from what I understand, it would be there but greyed out, but I do not even have that - there is simply no messaging tab!

I have been in touch with online support and it involved having one and then another tech connected to my machine for over an hour, and in the end he decided he'd solved the problem, but that the tab would appear within a couple of days.  It is now a couple of weeks later and it still has not appeared...

Attached is a screenshot of the "House Rules" page, where there is apparently supposed to be a tab on the right hand side (circled in red).