How do I ask for a reconsideration?
You have to use a form called Request for Reconsideration. You can get this form from any Service Canada office, or you can find it online at www.ei.gc.ca/eng/reconsideration.shtml or by typing INS5210 in the search box on any Government of Canada website.
After you fill out and sign the form, you must take it to a Service Canada office or mail it to a regional Service Canada centre. The mailing address for Ontario is:
PO Box 2602