Cheaptickets.com - I cancelled my 3 flights ,$4600, and they told me I have one year to rebook.When I called back 9 months later, I was told the Airline has your money

I cancelled my three Flights and they told me I have one year to rebook. When I called back 9 months later, they told me that the airline has my money which was not true because I had talked to the airlines the day before. I had saved $4605.30 over a few years to send my wife and two kids to see their grandpa for the first time but they deny it for them. I called cheaptickets.com  for a week and after long holds (probably over 30 hours total ) finally spoke to a supervisor and he told me that the airline will provide you the flight ticket but their price is $6000 per person now and the ticket will now cost me $18000.