Refile is the quick way to make an adjustment which is essentially only changing one or two entries which have been missed or need to be added in. It is not meant to redo all of the return.
The reassessment will need to be done by the Canada Revenue Agency (CRA) for the amount to be updated. It is recommended that you wait for your initial Notice of Assessment before doing a Refile. This way there is no confusion as to what was already received or not.