WORST EXPERIENCE EVER

Hired a car at King Shaka, refuelled the car to the maximum amount only to be charged by Sani for refueling. The car was filled to a point where no more petrol could be filled, it was right to the top. Emailed Sani repeatedly, they said there is nothing they can do, they refuelled the vehicle. The km's recorded on the vehicle inspection sheet does not correspond to the actual mileage. How is this even possible? Getting absolutely no help with them.