Wrong information provided by sales person

Today I went to purchase a vehicle at we buy cars centurion apon arrival I was directed to a consultant by the name of Hendry he was a very helpful guy and I asked I'm a couple of questions regarding the caution which was about to start. He stated that the caucation deposit was R5000 transferable to the next auction if I did not get what I want even if I bid I can cancel the bid and transfer the money to upcoming auction which I did not mind . Then i asked him if all cars are in working order and he said yes. Then he preceeded to assist me to register which I did I bid for an opel corsa (bid 810). Apon inspection with him we noticed the car has excessive corrosion from the front to the back on top it had cracks...... He then said it's not a problem we can carry the money over to the next auction and then can cancel that bid when we got to the auction managers office Dean he refused to do so he stated it's either I took the car as it is or lose the deposit we paid and his consultant does not have the last say and his the only person who can do that. I was led into a misrepresentation and trusted people who work there for help all I got was it's either u lose or u lose I even offered to buy a car over 40000 on show they said no all I wanted was a car after talking to Dean the action manager he just said his wasted his time talking to us and we just have those options available i don't think it's fair to be mislead by someone working at a company then ask for help then be told that no help can be provided. I really need help in this situation as it is im at a loss I cant use the money to bid in the future or to purchase another vehicle or even get a refund and I can't take a corroded car with me after being mis lead that I will be a happy customer. Please help