Best of luck! I had to go through three call centers Fiji -S Africa- Australia and maybe 7 agents to cancel our ticket within 24 when the simple date change became impossible with them. It seems QF procedures are not up to par with rules of these alliance tickets - their story in my case (had surface segment at the end in Middle East so the trip ended in another country) was that they could not find applicable fare, and therefore change a date. Even a supervisor wanted "to give a call back" before checking with help-desk, but we went ahead with cancellation. Very stressful experience and hard to imagine what it means to be in the middle of a trip when they tell you fare rules do not apply because it is technically impossible to change the date.