Welcome to the Community and thanks for your post!
I'm sorry for the problems you're having registering the handset for digital voice. I appreciate the time that you've spent trying to get this sorted out. 6 hours is a very long time to be spend contacting us.
You can get in touch with us and we'll get back to you. 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