Incorrectly billed

Sani can't accept that they made a mistake by billing for a vehicle incorrectly and then take forever to refund! ***. I collected a vehicle on the 25th of Dec 2023 from Cape Town International and on the 27th of Dec 2023, Sani contacted me and stated that the vehicle needs to be returned and they will give me another vehicle in the same size group. They sent a driver to collect and deliver the vehicle and then they charged me for the fuel usage for the new/swapped vehicle driven from Cape Town International by the driver and for the fuel usage on the vehicle that was collected. According to me, you collect a vehicle full of fuel and deliver a vehicle back with a tank full of fuel. How can they charge me for what happened in between with the swapped vehicle, I did not request a new vehicle, why am I held liable for the fuel usage where they took the vehicle back to Cape Town International. To top that, I raised the concern on the 9th of January 2024, today is the 22nd of January 2024, still no response nor any refund. Please don not use Sani even though their prices are the best, they do catch you somewhere for more money!