Claiming for damages I didn't cause

I rented a car from Europcar at Cape Town international Airport which I returned on 9 February. An inspection was completed and NO damages were found and my money refunded. FIVE days later I receive a phone call to say a cut on the tyre was found and I am now liable for the damages to the amount of R800! <br> <br> An inspection was completed and NO damages were found when I returned the vehicle! How ********* is it of Europcar to now expect me to pay for damages that I didn't cause. I have no idea who drove the car in the five days after I returned it! It is absolutely unacceptable to expect me to pay for this damage when there was no damages found when I returned the vehicle!