Misrepresented rates, non-functioning website

I went online to book a car, and checked prices on a number of companies' websites. Thrifty offered the best price - R2950 - and I proceeded to attempt to book on their app. The app, however, did not allow me to proceed to the booking page, crashing at every attempt. I called their call center, and received no response. As we were in a rush to get the car, I advised my partner to rush to the airport in a taxi, and to get the cheapest car available from Thrifty, and told him that I had done research and found them the cheapest. He went through to the office, and accepted the price quoted, even though he thought it high, again assuming I had chosen the right company and that the price therefore would be fair, without having an actual price benchmark in mind. He had even said to them that the price seemed high and that he was sure the price was lower online, but they said the online prices were consistent with the price he was quoted. The price he was quoted and accepted, unwittingly, was over R5,300!!!!! <div><br></div><div><em>(Report edited by Hellopeter.com)</em></div>