how do i get my esim if my old phone is broken?

What new phone do you have?

You should be able to start the esim set up process on your new phone and it will walk you through what to do.

Is your old phone completely dead?  Can it still turn on?

That should not be a problem. You can recover the eSIM by downloading and setting it up on your Self-Serve account. Make sure you connect to a wi-fi network to ensure that you get a notification on your device. https://www.koodomobile.com/en/help/esim-and-esim-vouchers 

If it does not work, you can also head to your nearest Koodo store to get a physical SIM card and update it to an eSIM on your new phone.