Bad customer service

I have booked a rental car for the 29th of September online and paid, unfortunately the latest you can pick up a car according to the website is 22:00 and my flight lands at 22:30. I have been trying from the 16th of September to get confirmation that somebody will be available to assist me at Cape Town International to pick up the car. I have tried emailing, not rep****, tried phoning the reservation number and my calls are dropped and when you speak to somebody they are very unhelpful. Tried the customer care but my calls are dropped! All I wanted is confirmation.