@Daphni
Do you have another email you can change your self serve account's email to? Like the one you used to create your community account? You can ask for a password reset to gain access to your account or go whole hog and change the email while your at it with the CSA. You will have to verify the account by answering some extra questions from the CRA about your account.
To contact customer support click below:
https://productioncommunity.publicmobile.ca/t5/notes/composepage/note-to-user-id/22437
To pre-verify your account include your full name, address, email, phone # and 4 digit acct pin #.
