priceline.com bait and switch airline tickets Internet

On October 25th 2011 I went to pricline.com to purchase tickets for me and my wife to go to Melbourne Australia. We sumitted a price of $2750.00 for two round trip airfare tickets wich was imedietly accepted! wow were going to Australia!!, untill. i checked the itinerary a few moments later and it said Springfield Mo to Melbourne Florida!!!??? we imedietly called and got a person in India i think and told them the ticket was to be to Melbourne Au.
 He tells us there is nothing he can do about it except offer us $2450.00 return. They would keep 300 dollars unless we resubmit a new ticket price  then the 300 would then be credited back to us AFTER we purchase the two tickets...How do we know they wont do it again? we dont trust any on-line travel service now
They keep the 300 dollars and we're just out of luck. I believe it's a bait and switch and we been took by them. Thank goodness we didnt purchace the insurence, that would have been lost as well.
I know some would say well at least you got most of it back, but in fact, how many others has this happened to?
Our trip was cancelled now because we dont have enough to go at the time we wanted to, so we have to save more money to go to a travel agent instead.