I have just returned to BT and set up our MY BT Account.
When I view MY BT on the app, it is showing 2 old accounts that were closed years ago and defaults to one of the old accounts and I can't switch it to the current account.
How do I get these old accounts removed?
try contacting Billing and they should be able to help you
https://www.bt.com/help/contact-bt/account-and-billing/broadband