Sometimes there is an activation fee for the eSIM but that should be it. If you have recently purchased a new device, they might hit you with an activation fee for that device, which I personally think is a filing a complaint with the CRTC and CCTS over. Some devices have a different IMEI for the eSIM, which is why the system thinks the device is a different one, if it is the same device you have beennusing.
Your old pSIM can not be reactivated so if you want to go back to a pSIM, you will need to purchase a new pSIM online or in a store.