They haven't replaced the copper, just turned off the old phone connection (there's no 12v? supply through it ).The hub is connected to the broadband socket and has a phone socket in the back.
Effectively we're now a broadband only connection. The digital phone is supposed to link to the hub (it registered to it OK) and calls are supposed to be via BB (a bit like Skype but from a dedicated number I suppose). The old analogue phone should connect via the phone socket in the hub.
The hub diagnostic says 'Phone not configured'. Their line diagnostic says Smarthub 2 not installed
I think they need to reconfigure the connection at their end but getting past their 'AI' ie 'rules based simpleton' is a bit like playing one of those games where you come up against a stupid opponent that refuses to die and you can't get past them. If you do any damage it just says 'contact customer support' and, when you do, its clone is standing in the way....
They're supposed to be rolling out digital telephony universally and switching off the powered analogue service. I foresee an issue or two. I suggest resisting until all options are eliminated if anyone is in the same boat. Nightmare scenario - old, non-tech, person with a personal accident alert/alarm, a home security alarm connected to a switchboard and no mobile phone or in a place with a crap mobile phone signal. They'll need an engineer to do the install and then, in a power cut they're stuffed if the house catches fire, or they need to make an emergency call for an ambulance or the police to enquire if they might possibly visit at some point in the not too distant future ).