Start with your own bank. Ask for a fraud complaint in writing. The pages below are the practical differences we see in how people open that complaint at eight Canadian banks. They are not endorsements, and they are not accusations.
Interac e-Transfers, card payments, wires, and crypto purchases are not all treated the same way. The review says which set your payments are in. If the bank’s own process ends without a refund, the usual next door is the Ombudsman for Banking Services and Investments.