Terrible Customer Service

I booked a car with First Car Rental through FlySafair for our vacation in Cape Town. Landing in Cape Town, a First Car Rental agent "slipped x2 R9000" ON HOLD amounts, instead of x1 the amount, on my credit card, and then added the nearly R8300 for the 9-day hire as well...which was already covered by the second R9000. I saw it immediately on my bank App and made them aware of the second R9000, on which I just got an, I apologize and it would be available again after 24hours, getting to my accommodation, I had to borrow money to pay part of my accommodation due to the extra R9000 that was "slipped" on hold on my card. In the end, it took nearly 48hours for the amount to be cleared on my card....and the apology I suppose had to pay for the accommodation? On return, the car was refueled past the first click, the slip was attached and discussed with the person who did the inspection, and agreed that the car was full and no additional damages were on the car... just to get my invoice with re-fueling costs added before the deposit was released. This was a terrible experience and service. These places are *****ing from customers. On query, again just, " I do apologize," and we also refueled....Stop apologizing and give better service to paying customers if you expect them to use your service again in the future.