I think the following quotes from my email exchange with BT speaks for itself. First my email to BT last Thursday:
Whilst this clearly addresses the question of how the second call came to be made after I had been placed on the opt out list, and I am quite happy to accept that explanation, it appears to say nothing about how the first (or indeed the second) call came to be made when my number was registered with the Telephone Preference Service.
Equally it says nothing about why the Complaints Management team were failing to manage my complaint by not replying to my earlier letters.
and in reply from BT I get this:
Following your email, I am now pleased to confirm your complaint has been closed as fully resolved with your agreement.
Strangely enough I don’t remember agreeing to any such thing. I guess I was wrong when I said I was getting somewhere with them…