FLIGHTSITE ABUSE CLIENTS WHEN IN NEED

I have made a booking to fly to Zurich and back with Flightsite, received a conformation that the booking is made. Two weeks later I received a notification that the booking has been cancelled, for not completing a document which I never received. This happened after I have paid the accommodation and visa application is in the process getting issued. I have contacted Flightsite and they said that there is nothing they can do I must make a new booking. The new booking cost about R8000.00 more than the first booking for the same dates and time, made the booking and pay for it by EFT. Four days later I checked the web for flights again same dates and it was R 4000.00 cheaper. I contact Flightsite again want to know why they overcharged me, they said there is nothing they can do. Flightsite took advantage of the situation where they knew that all accommodation has been paid and that I will loose more if a flight could not be found and overcharge me. DONT MAKE USE OF FLIGHTSITE THEY JUST TURNOVER DRIVEN NOT SERVICE DRIVEN.