Bags sent to Melbourne instead of Sydney... gone forever?

Today my family and myself travelled from darwin to sydney.
As we were boarding the plane, a jetstar staff member informed us that our checked bags and stroller had been incorrectly labelled and put on a melbourne bound plane. When we landed at sydney we spoke to a polite lady at jetstar baggage services who did some checking and said that she had no record of anything relating to our bags. She filled out a lost baggage form on our behalf, and assured us that the bags would quickly be flown back to sydney, and we would have our bags couriered to us by 6pm that evening.
At 3:45 this afternoon, my wife spoke to a jetstar staff member on the phone (possibly in a manilla call centre judging by her accent) who said that she had tracked our bags and that they have just landed in Sydney. She would call us back in half an hour with more details.
As i write this at 6PM, we have still not heard back from anyone.
At 5:30, after repeatedly trying to phone the baggage services desk at sydney airport (nobody ever answered the phone), my wife rang the qantas desk, located directly next door. My wife then asked the operator
a) if there was somebody at the baggage services desk at jetstar (which there was)
and b) if that person was on the phone (she wasn't)
So the qantas staff member put the jetstar baggage services staff member on the phone to my wife, who seemed quite inconvenienced at having to deal with someone over the phone. After giving my wife a lecture on the meaning of the word "condescending" she promptly hung up and has refused to answer the phone since.
My wife's medication is in one of the 'lost' bags. We did not bother to get a repeat script since we were told the bags would be reunited with us today. As well as the other major inconveniences of not having our belongings or being able to take our children out of the house without our stroller, this is now a health issue.