Unfair treatment and ********* behavior

I returned a car to King Shaka Airport branch on Sunday after refueling the car few meters away from the Airport and gave them proof from Petrol Station, a day later they charged me R381 for fuel, this is unfair because the lady that assisted me confirmed that everything was in order but later they do their own thing, can I please be refunded my money and the this day 4 without releasing my deposit R4000,00.