Well, you should call the local Qantas office you have and ask them to correct it for you(which would require several times of pleading). You may also go to www.qantas.com.hk and look out for your own.
It's simple. You can simply phone them by 16 009 661 901 (Australian) or 2822 9000 (Hong Kong). Or email them at [email protected] . You can see for yourself at www.qantas.com.hk . Hope I can help you!