Yes, they are utter utter cnuts.

I have a vodafone staff mobile and they've even rung
that saying that I'm due for an upgrade, they soon hang
up when they found out it's a staff account.

I believe that Vodafone are investigating them at the
moment with a view to removing themselves from being
offered by communications direct, if you get a call from
them and you're on Vodafone, call customer services
and have them log it with the relevant department.