Update for anyone reading this thread in future.
Someone from the Home Tech team called today to say he had fixed the line. The issue was a config file in the smarthub that had conflicting sets of contact information. The engineer remotely deleted the file and injected a new config, and just like that, the phones are working again.
Why this wasn't checked on day one when i told them the phones were not configured in the hub, is beyond me, but at least it's fixed now and we have our old number back.
😴
The engineer mentioned that a DV adaptor was causing a conflict, so i asked the Digital Voice team what the issue was. They had no idea of course, but would send me a replacement. They sent me an ADSL filter..
Is that it then, BT have just given up caring? Alt-net cant get here fast enough.
The microfilter is useful on the DV adapter, if you have an old wired phone which needs a third wire to allow it to ring.
Maybe, but it isn't a Digital Voice adaptor that is needed to replace the faulty one..
I cannot see how the DV adapter, which is only a DECT receiver, could cause number issues.
It would have been the config file, which holds the phone number and security details, that would have been the issue.
The DV adapter, if you still need it, should work normally.
Didn't make much sense to me either, but just adds to BT's general inability to present a coherent service.