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I got a Submit a ticket link after typing "Representative", selecting Contact Us, and selecting the reason.  It also gives a link to message CS_Agent

https://www.publicmobile.ca/en/on/get-helpYou can click Start a chat on the get help page.

I think you'll need to call support to get them to reset the eSIM.  You can also buy a physical SIM and change the SIM Card Number under the Profile section when you log in to your account on the website.