If your travel dates have passed and the business did not provide the service (as opposed to you choosing not to go) or if you have been informed by the supplier that your future travel has been cancelled, and you paid by credit card, you can notify your credit card issuer in writing to request that the charges on the card be cancelled/reversed. There are things to know about doing that, including specific timelines and limitations.
Visit your credit card provider online to read up on their requirements and processes. There is no law that we administer that requires a credit card issuer to reverse charges for this type of purchase. Typically, this is governed by individual cardholder agreements. If you are denied by your credit card issuer, you will need to go to the Civil Resolution Tribunal or court (depending on the dollar amount) to seek compensation from the business. You may also want to consider seeking legal advice.