Beware of Petrol Claims

I hired a car from Sixt. When I returned it I filled up at the King Chaka International airport. I was told that they had to fill up the car with additional petrol and when queried they provided an 'invoice' with their own name on it. Ensure that your car is full when you return it and make sure the person checking it agrees that it is AND take a picture of the fuel guage.