Interesting! I thought merging was not possible, and it happened twice for you. Do you think merging a paid (points or cash) is maybe not possible, but merging a pending payment booking is somewhat more achievable?So my experience with is:
Try to get Australian call centre - but this is virtually impossible.
I have a rewards flight with a 60 minute connection in LHR. Original call centre person told me it was 'legal' and no probs (Obviously never heard of LHR let alone been there).
Another call and the next operator agreed and put me on a flight 5 hours later.
This was about 2 months ago for flights 4 months out.
Result = QF can move/change rewards flights
In relation to not seeing award flights - Had the same issue, Aussie call centre lady very helpful, genuinely could not see the flights I could. Her solution was to have me book the flights on the website, not pay/complete the booking (so no points lost) give her the reference number and she merged them into the original booking.
Result = QF CAN merge individual bookings. I have been told yes and no by different people, but twice have been able to merge so I think persistence is the key.
I was Silver status at the time so I don't think your loyalty is a consideration. You will just need to keep hassling them until you strike an Aussie call centre. I have been told before 7am is the best time to do this but have not proved it.
Can you confirm that the booking was genuily fine, i.e. did you already travel on it?