False Advertising for Car Hire

We recently hired a car from the Flysafair website (First Car Rentals) while booking our flights to Cape Town. The option we chose was the R781, which was for 3 days, pick up on Thursday morning (26th of April) at Cape Town airport (when my husband arrived to collect the car, they said the car will only be ready in the afternoon, luckily something was sorted out) and drop off at George Airport on the 29th of April. Firstly, i received no invoice/confirmation for this booking, but when I enquired I was given a booking number (***) so there was a booking. I received my bill and it was much more than that I have selected online. There was also an additional charge of R800 (one way domestic extra charge). I can not help but feel absolutely **********. Why did the option I chose say R781 after specifying where I would collect the car and where I would drop it off. I would never of hired the car at this price, I would of flown to George and that would of been cheaper. I need answers as to how you can advertise so falsely! I have tried to solve this matter with First Car Rentals, but have had no response whatsoever!