Hello,
Here’s a tale of bad customer service from Virgin Media. It’s long but it might help someone else in the same situation get a result. If there’s a moral it’s to not accept what you are told can and can’t be done.
http://virginmediasuperhub.blogspot.com/
Apologies for posting this if it's a breech of forum ettiquette. I told Virgin I would be posting my story of poor customer service in as many places as I could so I'm doing so. Hopefully someone benefits from the confirmation that you can reverse the Superhub upgrade if it's not working.