Orbitz Orbitz charges your credit card even though the flight is no longer available. Internet

I spent a good day talking to an Orbitz representative to get five pending transactions removed with my credit card company so that I can actually book a flight.  There were about $5,000 worth of charges made from Orbitz.com because every time I tried to book a flight it said that it was no longer available.  If it's no longer available, why does it still charge my credit card and why does the flight that is no longer available still show up when I re-do the search for my flights causing me to book non existing flights while Orbitz keep charging my credit card company.  I kept on trying until my credit card fraud department called me to ask me if I booked six flights in one day.  Really Orbitz!  update your online system and don't charge a customer when your own booking system doesn't generate a confirmation of the flight.  btw guess what the tickets I was trying to book went up $150 by the time I resolved all this issue in three hours.  I'll just wait for the price to drop again.  And please get some reps who have a good English accent because I can't understand with the heavy Indian accent.