If you haven’t received a refund yet, check your bank account just one more time before contacting us - refunds sometimes take some time to be officially processed and appear on your account. For peace of mind, also contact your card issuer (the financial institution who provided you with your card) and inquire on the status of your refund.
You should definitely contact us if your credit card issuer says they don’t see any refund to process - we’ll definitely need to double check.