Claim of damages

I rented a car on 1 Mar '15 at 3pm from K/Shaka Airport. No Avis personnel were present to check the car for any damages with me. I checked myself, all seemed ok. <br> <br> When I had the car with me I noticed that the car was dented on the drivers side. The dent cannot be seen unless scrutinised closely. I had taken pictures and the dent cannot be seen clearly from a diff angle which is why I did not notice it on the day I had picked up the car. <br> <br> I returned the car on 21 Mar '15 at the Amanzimtoti Avis. I returned to Avis Amanzimtoti on Monday, 23 March as I had left behind personal belongings in the car. <br> <br> The Avis personnel walked me out to the car and advised me if I was aware of the dent on the car. I told her I was and that I had taken pictures of this. She walked me to the car and showed me a very minor dent on the front passenger side of the car which cannot be seen to the naked eye. I showed her the dent I was talking about and she advised me that Avis was aware of this dent that I speak about. After I left she calls me to say I am now liable for this damage and need to take it up with King Shaka.<br> <br> I will not be held liable for damages that I did not cause!