Hail damage impossible to insure against with hired cars

On 24 May 2024 I hired a VW Polo Vivo at King Shaka Airport until 4 June 2024. On returning the vehicle the inspector identified 2 small dents on the roof of the vehicle and said it was definitely hail damage as there had been a hail storm the previous night and all the Tempest vehicles in the car park had gotten damaged. So if I hadn't hired the car, it would have been damaged in exactly the same way, as Tempest makes absolutely no effort to protect their vehicles from hail damage. Yet I am expected to do so!?! The day after returning the vehicle I received an email requesting me to complete a survey of the service I received from Tempest. I raised the issue of the hail damage saga. I was called almost immediately by someone who was very apologetic and assured me it would be looked into and feedback would be forthcoming. I have heard nothing since until now when I received an automated invoice for the hail damage repair to the tune of R6,209. Thanks for nothing Tempest!