Avoid this company

I hired a Kia picanto reg 1071-jny on 4th July 2016.i photographed the car on pickup and everything went well until I returned the car on 11th July.The lady ( I use the term loosely ) from the office came out to the bay where I had parked and went straight to the front offside of the car and looked underneath stating that there was massive damage.I had to get down on my hands and knees to see what she was talking about.She knew just where to look and didn't look anywhere else on the vehicle.i advised her in a calm manner that I was not responsible for this damage.She then became racist stating that "you English are all the same.You give us a hard time and cause us many problems" .i advised her that this damage was initially visible unless you you got on all fours and checked underneath the vehicle.Her retort was " if I can see it you can". She then went and brought another employee who verified the damage.The company have now withheld €300 and will advise me of the bill for the damage.I feel that perhaps the car was not checked properly previously and they had to find a fall guy.There is some scheme going on. Be very aware if you have dealings with this company.They are horrendous!