+1
If there’s been any schedule change since you first booked, you may be able to cancel and get a refund on that basis alone. Check what was first booked versus what you have now. Sometimes they’ll allow cancellations or full date changes with only a nominal change in flight time.
If not, find out what kind of fare you have. If it’s a “Basic” fare, you’re out of luck. If it’s any other fare, you should be able to cancel and get the balance (minus a change fee) held as a credit with WestJet for up to a year.
You’ll need to go through Chase (rather than WestJet) to pursue either option. Since you didn’t book directly with WestJet, they can’t touch the file anytime prior to the first flight segment.