Wanted me to pay R1800. Quote said R327.01

This morning we made a booking for a rental car, on [URL Removed] for an Avis car. We had to pay R22.28 deposit, as well as R82.95 for drive easy premium excess car cover, which we paid by credit card. We then printed out the booking confirmation, which stated we still had to pay R304.74, upon collection of the car. Both our own cars are in for repairs today. We took just enough money as the booking confirmation stated