As I have already said very clearly in the email you have included in your reply, it would cause considerable problems to be called on the number BT nuisance called, and I have on multiple occasions made it very clear that BT do not have permission to call me on that number. Equally, my experience of BT is that staff are prepared to be blatantly dishonest, therefore I place no trust in verbal communication. All communication should be by email or in writing, and I prefer email because I do not want the hassle of disposing of junk snail mail from BT.
You already have the phone number which you have been calling despite being told not to.
You already have my name associated with that phone number, including in one of your nuisance calling lists, and you have confirmed this by promising to mark the number as one not to call. Equally you had sufficient information in that junk calling list to mention details of the previous account so it is clearly on your systems somewhere.
You should, under the Data Protection Act, have recorded that you have been refused permission to make nuisance sales calls to my number.
You should have a record on your complaints system from when I became so annoyed with BT’s dishonesty that I spend considerable time making it very clear that your behaviour was unacceptable.
If you check your domestic and business accounts, complaints system, and data protection records, you should find all the information you are requesting. Equally, if you check your own records and confirm the actions you have taken I will have slightly more confidence of BT taking appropriate action than I would if I spoonfed all the details only to receive a bland and unreliable assurance that the problem had been dealt with.