Already emailed Melb. office as well as visited in person. Didn't want to know me, stressed that Qantas has to communicate to them about booking.Have you already chosen your seats Adrian?
My flights were from Sydney to PVG and then onward to Okinawa.
What I did was to email the China Eastern office in Melbourne/Sydney, gave them my ticket number starting with 081 and told them my preferred seats.
They allocated them to me within 5 hours and I can see my seats all show up when I log into my Qantas account and check under my bookings.
I guess having a seat sort of means a confirmed ticket.
May want to try that out, hopefully it works.