Terrible service

Terrible experience with this company. I booked and paid for a car online, and everything was good. I was sent confirmation that everything was in place. However, upon arrival, I was informed that they would not release the car to me based on a system error they received that flagged me as an undesired driver. Now my question was why was this not flagged at the point of booking the car? I just landed and expecting to take the car and attend to my itinerary, but now I dont have a car, and they cannot refund me immediately as the system also doesn’t allow that. At this point I was very upset as I have to make a plan to go to another company to book a car (which i was gladly assisted by the way), which requires me to pay again. What if I did not have the funds to do that? They are a total waste of time!!! Oh and to too it up, the staff sitting at the back are having the time of their lives giggling their lungs out. Shame