Gross blunder by Management leads to car wreck-Fallo garrafal Administ

Pros: The car was clean and new

Cons: Upon picking up the car, I was instructed by Roberto( in portuguese), who is also the manager, to exit by the entrance door, even going the wrong way into intense traffic. I have video and photos to document the ordeal of having to exit the rental facility. An acute right turn has to be done to merge on the one-way street. While watching the oncoming heavy traffic from the left, I veered inadvertently onto a ditch, like 8 feet from where an steel ramp ends. There is no sign or precaution to make the driver aware that the platform ends and you going into the abiss. After inspecting the damage I called Roberto (the manager who gave me the car) to make him aware of the damage done by lack of signage. He said that as long as the damage was due to that particular incident they would let it go and they would assume it. Today that I went to return the car. Upon checking the damage they said that I had to pay $200 in damages. I dissagreed and told them Roberto said they would assume the damages. Roberto was called and changed the history denying having accepted fault for the damages. So far they insist to place the blame on me for their lack of oversight and prevention. Now, they want to charge me. Tomorrow I have to go and talk directly to Roberto and get my Credit card voucher back. I intend to fight this until the very end. A little common sense and a little sign would avoid this.