Leg room scam

I have for the second time fallen for the leg room scam.It appears that jetstar let a number of people to book the same extra legroom seat and then re- allocate the seat just before the flight. So in effect many many people enter a lottery for the seat and Jetstar have use of your money for a considerable time with no intention of delivering the purchased seat.I believe this is dishonest , how many service providers can take your money fro something they KNOW they cannot deliver.I could make a living selling something that doesn't exist if I only had to refund the money after investing for7 months .
The excuses are utter rubbish but listen to this, They offered me a refund as a good will gesture. What a joke , a good will gesture to get what is mine back.
What about the people who don't complain, no refund ?