Overcharged for a a car in poor condition.

The car I rented from Europcar was in a very poor condition. When reaching 120kmh the cour would vibrate vigorously. In addition there was packing table all around the rear window which at some stage must have been broken but the tape never removed after fixing. The tape also had damaged the paint. When I returned the car and told the sales lady she said the vibration was normal! To add insult to injury I brought the car back a day early and they still charged me for the day!