Your TA has control of your ticket.
Have you looked at the QF web site?
QF29 for 21 Feb is still for sale (no business class being offered)
QF29 23:55 Melbourne 05:50 Hong Kong
MEL-HKG will probaly be effected by the QF changes just announced
Look here
http://www.qantas.com.au/travel/airl...irit/global/en
http://www.qantasanswers.com.au/medi...ugust_2011.pdf