I have exactly the same problem and just been onto BT call centre and they cannot fix it please help.
Welcome to the Community and thanks for your post! I have moved your post to start your own thread discussion.
I'm sorry for the issues you're having with your email address on Now TV and that you couldn't get this sorted out over the phone.
I have sent you a private message with instructions on how you can send us over your details and we'll look into this for you. See: Private messages