If you pay peanuts you get monkeys

Jetstar has failed to provide a cancellation letter and refund in a reasonable timeframe.
Jetstar cancelled our flight from Sydney to Christchurch due to Volcanic Ash for "safety reasons" (I suspect the real issue for Jetstar was the cost of the extra fuel needed to fly beneath the ash cloud as other airlines continued to fly safely at the time) . We eventually re-booked and made it to Christchurch to connect with our Queenstown flight. After sleeping at the airport terminal we proceeded to check in for the Queenstown flight, all seemed ok, however after waiting 30 minutes after the scheduled departure time, the pilot and crew left the plane and returned to the terminal. Half an hour later we were advised that the flight was cancelled due to engine issues (I suspect Jetstar's preventative maintenance is lacking).
Twelve working days have passed and still no refund in the promised timeframe. We had also requested a cancellation letter from Jetstar for our travel insurance claim. We were advised that our cancellation letter would be issued within the next 10 working days by post. As the letter never arrived, on Day 12 I called Jetstar and after 1 hour on the phone with numerous reps from Jetstar "Customer Service" I was told that it would be 20 working days, then someone else told me 10 working days, then again 15 working days. In brief, I've been advised I should receive the letter after 25 working days. Watch this space and don't be fooled by the promise of cheap airfares.....if you pay peanuts you get monkeys. Jetstar, your business won't fly.