Hi @hawthornuk,
Welcome to our Community Forums! Thank you for your first post and I'm very sorry to hear that your mother's account has been impacted by the home phone switchover and that a new contract was applied onto the account without discussing this further with the account holder.
I'll be more than happy to review the situation with you and see what we can do to help going further. I will send you a Private Message, so please keep an eye out for a purple envelope at the top right corner of your Forum page. I will be in touch soon,
Thank you.