Fitted the same kit in mine and got the same results.
All sorted now though after a couple of hours with a volt meter and lots of wire!
If you are still stuck i would be willing to explain....
In short, because the Altea uses "data" to power up the head unit rather than "Switched Live" like most of the new VW range does, it means they have not put a switched live on their ISO plugs for the head units.
The Parrot unit relies on the switch live to know that the car is turned on, and therefor power up the Hands Free System.
I had to source one form the fuse box, fuse it up and place it in the correct plug on the Altea ISO plug.
Hope that explains it, if you need any more details, just let me know!
Thanks
Chris