Thank you for posting.
If you take a look at - How to return and recycle our BT equipment for free you'll find the details for returning your equipment back to BT for recycling.
We made some changes to our Terms & Conditions on 13 December 2019, meaning that BT Hubs and BT TV boxes are being loaned to you. So if you joined us or have renewed your contract on or after this date, you’ll be charged for not returning equipment to us. You’ll have 60 days to return it from the date you stopped using it before we charge you.
If you would like to return the equipment to BT free of charge, post back and let me know and I can arrange for a return bag to be sent to your address.