We have put together a short survey to capture your feedback in terms of what BT can do when you experience home Wi-Fi issues. We would appreciate it if you could take a couple of minutes to complete a short survey. Read more from here, Fix my home Wi-Fi
As you have posted on email board do you mean you are currently paying for premium nail to retain your bt email address as no longer a bt customer?
you can either cancel your prism mail and lose email address or become a bt broadband customer and move email to new account and stop paying for premium email