I have the same problem. Returned BT Broadband kit at the end of October /early November 2023 after closure of account. Equipment returned via the large white pre addressed envelope posted to me.
Received numerous text messages harassing me to return the equipment, with no way of cancelling the text messages or to inform the items had been returned. Received a new final bill for £50.00 on 25. 12.23 - nice Christmas pressy 😒.
Engaged with BT chat, who cannot locate the items without tracking number, which I cannot locate, referring me back to courier who cannot do anything. I am disputing the charge and lodged a complaint with BT on 3.1.23 - BT replied by text asking me to visit BT.com/contact within 14 days if the problem has not been resolved, otherwise the complaint is closed.
I returned this equipment in good faith, well before the deadline of 15 December 2023, using the correct bag as sent out to me and now I’m expected to pay £50 because of some ‘sloppy’ inventory controls.
