Unreasonably money deduction

Hired a car. On Pre inspection both myself and the avis representative agreed on a mark on the driver door. Representative made a note on his phone (can not see what he writes, assuming that he makes a note as agreed on) Returning the car with post inspection, still only 1 mark om the door but not aligning what it says on the system and deducting money from our account. This is unacceptable as there is still only 1 issue on the door. We need our refund.