Cancelled Flight 35 minutes pre-takeoff and refuse refund

My Jetstar flight this morning was cancelled by Jetstar 35 minutes before takeoff at 0605 and Jetstar refuse to reimburse me. The NZ Consumer Guarantees Act says that if Jetstar cancels a service they need to reimburse passengers if a change is unsuitable. I was due to help a friend in hospital and a later flight was unsuitable. The Jetstar overseas based office was unaware of NZ Law and insisted they could not reimburse the fares. My PNR is CQKSNE. JQ251, Returning JQ258.