Booking forfeited due to poor communication

My family and I have been planning a road trip to France for months. We spent 2 days in Paris after which we went to pick up our car rental. Which we booked 2 months in Advance. When we got to the car rental agency. Due to a miscommunication they ended up giving our car to another customer. We were stranded. No way of transport and the company refused to give us an appropriate alternative. We ended up paying four times more than what we would have for two different cars at Europe car where the service was excellent and the people friendly.