For all those saying that this is clearly the pax's fault, in 2022 we (2 adults, 1 child and 1 lap infant) were travelling MEL-xSYD-LAX with an overnight in SYD on one ticket. The day of the MEL-SYD leg our original flight was cancelled, and in the rebooking process QF cancelled the infant...
Unfortunately another example of why the outsourced call centres are completely incompetent and that QF management continue to show utter contempt for their customers by refusing to improve service.