Still charged after filliing car up FULLY

After renting a car from Tempest for our Honeymoon, I filled up the car fully to automatic stop using unleaded 95, as requested by the salesperson upon collecting the car. I did this right before dropping off the car.<br> When I dropped off the car, a Tempest employee checked everything on the car and said I can go. I asked if everything was fine, including the amount of petrol I filled. He said it's fine. A few days later I get a bill for an extra R53.50 for refuelling. I emailed Tempest and they told me it was not filled up fully. They also charge an extra R10 for filling up themselves. I filled the car up exactly as was explained to me. No one has responded to any of my mails after that. What proof do I have that the money actually went into the car. I would have rather filled the car higher myself, but the Tempest employee said it's filled up fine. It was also not specified anywhere EXACTLY what the car must be filled up to.<br> <br> Tempest are *****ing small amounts from all their clients by doing this and charging an extra R10 for this as well.<br> <br> I find this totally unacceptable.