It appears that AC 869 arrived 4h11 late on the date you mentioned, meaning that you are entitled to compensation if Toronto was your final destination (or you arrived to your final destination more than 4 hours late) and the delay was controllable.

You should contact Air Canada directly to request compensation, spelling out the essential details including date, flight number, booking reference or ticket number. It's always better to request monetary compensation rather than airline funny money and acceptance of any promo codes may waive your right to compensation under the EU regulation.