UNHAPPY CUSTOMER : Impossible refueling charge !!!!!!!!!!

I hired a car (Stepway) this Tuesday (14/01/2020) and returned it back the following day only having driven 192Km , I refueled the car to a full tank approximately 3km from the Lanseria International Airport which amounted to +-R150 , I received my invoice today stating that the care was refueled with R217 fuel. This does not make sense to me , I am a weekly customer and and R367 for fuel over 192km in not possible and seeing that I had just re fueled the car! I've called in and have not head any response back. This is utterly disappointing as I use your car hire company on a weekly biases.