That's a very poor show from Trailfinders but it does demonstrate how booking one of these direct with the airline has its advantages. Suggest you print out one of the star files of the fare rules for ONEs and remind them that a date change is not chargeable.

Failing that, if you haven't already tried it, suggest you find out the locator for the QF and LA bookings (should be able to retrieve this from the lead locator on your intinerary printout) and call the airline direct with this info.

Wish you luck, this kind of things is really annoying, especially when you've shelled out on A class.