BankFodder,
Many thanks for your advice and I totally accept that I have gone about this in the wrong way. If only I had asked for advice before putting both feet firmly in it!
In my defence I wrote the letter to BT, while in a bit of a strop about their behaviour, prior to going away for a fortnight and was somewhat wrong footed when I actually got a call from BT two days before leaving.
I do actually have recordings of the calls I made to to BT but not of the last one they made to me on my mobile. There are no transcripts, simply an audio file for each call that I made.
I have bee