Bad attitude of personell

I rented a car at Cape Town airport on the 15th of November 2017. There was a queue of 20 minutes which with hindsight is surprising considering their poor performance. Avis had somehow got the dates wrong and when I arrived at the airport told me that I made a mistake. Even after showing the one behind the desk their booking confirmation she still maintained it was somehow my mistake. I insisted on seeing the manager who eventually appeared. She did not accept responsibility and tried to blame her subordinate for her poor performance. Pathetic all round.