I'm in the process of sorting out the accounts of an elderly relative. It turns out that for over ten years he has been paying for two phone packages - one from BT, and one from TalkTalk (originally sold via OneTel).
We have canceled the TalkTalk service, and have sorted out billing with BT, who have been very helpful.
However - at the moment all voice calls on his landline (other than BT services, 1571 etc) are routed via TalkTalk. From a lot of Googling I understand this might be due to a Carrier Pre Select setting on the line.
TalkTalk have been unhelpful and have little incentive to assist as we're shutting off their service. Is there any way for BT - who own the number, and receive the line rental, etc - to cancel the CPS and return calls to being routed normally? Does anyone know how this could be arranged?