Europcar taking a chance.

I hired a car on the 12 May - & returned it on the 14 th May. When i dropped the car off at OR Tambo airport, the lady took the keys etc. I still showed her a small scratch on the bonnet which wasn't on the check list. This morning I got informed that there is a damaged wheel & rim!!! I am trying to reach the people but no one is getting back to me. This claim is utterly a load of nonsense & incorrect. My reservation number is *** Please I need you help I believe that the car was never checked properly when it was brought back form the previous hirer.