Billed for fuel after we filled up

We would like to challenge the fuel on our rented vehicle because we filled up the car in Franschoek at the Franschoek BP Garage with 43,565 litres.<br> We then drove straight from there to CT Airport. On our invoice we were billed for 43 litres. There is NO WAY that we could have used up 43 litres to get from Franschoek to CT Airport - it is only about 70 km!!<br> We were in a bit of a hurry to leave the car with Avis as we had a plane to catch at 4pm and we still had to check our luggage and a cat on board our flight so we regret now not waiting for the invoice!!<br> <br> We were billed for 43 litres - as if we had left the car dry! There is obviously a staff member of Avis who is *******.<br> I emailed the customer services on the 18 March - had no response as yet - emailed again today! I have a copy of the fuel bill when I filled up as I used my credit card.<br> The problem is that one can only use a credit card to hire a car so basically they can charge you what they want with no recourse!<br>