If you contact your bank they will have a information about the direct debit claim which you as a customer do not routinely see, for example they have the reference number quoted by BT via their bank so that if the payment were to be bounced they would know at BTs end which customer did not pay. You may also be able to see the reference quoted if you have online banking.
Typically that reference number is the BT customer account number. You could then check it is yours and if not use that in a phonecall with BT to put the two ends together.
Dont forget, under the direct debit indemnity scheme you can simply contact your bank and ask them to return it unpaid and your account will be immediatly recredited. That will then get BT, in theory, looking at it it from their end althoughI fear the automated systems will simply try again at least once. I would not bounce it without first calling BT to tell them that is what you are doing and getting someone to note it on your file.
