Misrepresentation of costs and overcharging clients

We reserved a Group J1 vehicle on 06 August 2021 for rental between 19 November and 26 November on the Thrifty website. We got a total amount due of approximately R7400 before adding any extras to the reservation. The website allowed for us to add extras for additional driver (R350), tyre and windscreen cover (R305.20) and cross border fee of R1500. This gave us an all inclusive balance of R9502.59. We were requested to pay upfront deposit of 25% and the balance was due on pick up date. We kept in touch with the company via email regarding requirements for cross border and emergency assistance arrangements once we cross the border. It was clear that we intended to cross the border with the vehicle. However, to our surprise when we got to the pick up point, we were told our reservation did not include cross border fee and in addition to this we do not have approval to cross the border with the vehicle. We were informed no cross border applications can be done online and these are only done in person when picking up the car. Imagine having planned your international trip with accommodation and everything else being paid for only to be told you cannot cross the border with a vehicle that you reserved months in advance and the reservation clearly states a cross border fee. I was very disappointed by the service and treatment received. We had to apply again for the cross border approval and pay another R1500 in additional to the one already included in the reservation. I feel this was a misrepresentation of costs by Thrifty as we could have gone with another better deal from another rental company. But since all was already planned and we needed the vehicle asap, we had to bend to Thrifty's hidden costs which were not made clear from the onset.