How do I register for Self Service if there is no email on the profile?

I am trying to help my mother who uses a flip phone and has no computer to use Koodo Assist. I don’t think there is an email address on her account (because she doesn’t have one) so I cannot login to request a call from a representative. She has a billing issue that she needs to talk to someone about. How can I arrange a call with a representative if Koodo Assist cannot be accessed?