Jetstar cancelled the international flight in 12 hrs before departure

FROM JETSTAR Guarantee:
At Jetstar we never cancel flights on the day of departure for commercial reasons, or when we have not sold enough seats. However, despite all the efforts we make, it is sometimes unavoidable that a flight is delayed or that we have to cancel a flight on the day you're due to travel.

But,
Due to engineering requirements your flight JQ7 30/12/2018 from Melbourne to Singapore has been cancelled.

We apologise for the unexpected change to your travel plans. For help with your booking, or to check available alternate flights, choose an option below:

Nothing I want to say.
Never jetstar!

International
Australia-Melbourne - Tullamarine
Singapore-Singapore