Thanks very much for the advice - I have confirmation of the cc charge, and I also posted a calm & collected, just-the-facts message on the Qantas feedback system.
An email with a duplicate copy of the e-ticket and receipt suddenly appeared late last night....
I did speak to a supervisor on my last call, but she was the least helpful of them all. She just repeated the mantra that it was illegal for her to give any details, and that her purpose in life was to make sure all the staff do the same, and that there was nothing 'they' could do...
My friend who made the same booking for his missus at the same time had the same problem (no email), but saved the page with the booking reference.
My concern is that they hide behind all this 'privacy' regulation, but it seems that the system as a whole is pretty unreliable. Ho hum....