The only way to reliably change flights with Qantas is to rebook online and cancel the original booking. My flight was changed by Emirates, Qantas failed to re-ticket my flights, I called Mindpearl Manila multiple times and eventually they ticketed my first class booking in economy, I told them of their mistake, they hung-up. After about a week of trying to contact someone competent in Hobart I gave-up and rebooked. I still have my first class tickets but Qantas all but called me a liar, they only saw an economy booking and were unable to receive emails, so I could not prove otherwise. That was in February. I'm still waiting to hear back from Qantas (ie the airline, not the wine merchants - they call me regularly). I would prefer to sit on hold for a day knowing eventually I would get someone competent, than spend a week trying to avoid Mindpearl. Qantas has done irreparable brand damage to itself. Time to shut down Mindpearl or change your core business to selling wine.