Did you try forgot password link? if you put in the correct email, you will then need to answer the security question.
if you are unable to get pass that.. then only Customer Service Agent could assist via proper ticket:
(After you open a ticket with CSA, please monitor your Community inbox, envelope on the top right. CSA will communicate with you via messaging within Community)
1. For faster response (2 to 48 hours), Click on the bubble in the lower right corner and request moderator assistance, or you can also use this direct link instead https://publicmobile.ca/chatbot. Start with typing "Submit a ticket", click on "Contact Us", click on "Other" from the choices, click "Click here to submit a ticket" then Follow the prompts to submit a ticket.
2. Or you can Send a private message to the moderator here: https://productioncommunity.publicmobile.ca/t5/notes/composepage/note-to-user-id/22437
