Been a few weeks since I had this problem. I thought I would provide an update in case anyone else has experienced this.
Following several exchanges of e-mails , calls to BT using my mobile , three formal complaints, an "engineer's" visit (who thought they had come to install my SmartHub 2 and not fix the 'phone as they admitted to having no training in Digital Voice) and my threatening to refer the matter to the Ombudsman one of BT's Executive Team took up the case.
It was quickly discovered that the problem was caused by the port in the exchange not being properly configured during the switchover to DigitalVoice. Perhaps I am naive but I would have thought this should have been one of the first things they checked. This has now been rectified and the service is back to normal.
The downside is people who call me have become used to my landline being out of action they have been using my mobile number instead and are continuing to do so, so the landline is now not heavilly used. 😞
