First of all you should be aware that there is no 'u' in Qantas. Getting the name of the airline will helpful in the first instance.

In respect to your complaint, you should keep in mind that you will possibly be entitled to EU compensation as your QF flight was ex-EU and delayed over the threshold for the distance travelled. I recommend you search for the thread on the BA forum for the thread on EU 261/2004 compensation and claim accordingly. QF will probably try to weasel out of compensation initially, but a well drafted and factual letter with no emotion should yield an appropriate response.