EXPEDIA TRAVEL misbooked, misquoted and defrauded Internet

booked a flight through Expedia.  Called Expedia to ask to add son to itinerary. sent to AIR TRAN (who is also horrible). sent back to Expedia.  found agent at Expedia that said they could fix problem.  was on the phone from 1:10pm-3:45pm. 
the agent then cancelled first flight and rebooked me and son on different flight, returning us home 1 month not 2 days from agreed upon itinerary.  tried to charge us $775 over $409 to fix.  waited on hold for manager for 40 minutes, said agent admitted mistake then escalated call to corporate. 

corporate said they would make it right and reinstate my original flight.  I said if you want to make it right, give me the price on the flight arrangements that agent told me i would get for my son and I.  Ray at corporate said they could not do that even though the agent made the error and admitted it.  i asked what are you making right then?  just refund my entire booking and i will never use again!  she agreed. i feel defrauded to say the least.   what did i gain form wasting 2.5 hours?  i travel several times a year and never experienced this level of incompetence!