Horrible service and a total *******!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I rented out a car for 5 days and i was charged 9800 and on my card i was charged 12500. when i ask about the deposit they always advise me that there's nothing pending on their side .i even called Nedbank to confirm the amount i paid to Avis but I'm still getting no assistance. their customer care agents are rude, and they don't have the patience to understand customer's concerns. so basically, I rented out a car for 23k.