Worst ever experience,nightmare deposit transactions and unauthorized debits

I rented a car on 17 March 2023 for 2 days. Was requested to pay over R10000 in order for the car to be hired out to be. +- R2800 towards rental and +- R8000 towards deposit. I've had to even contact my husband so that he can top up my account to make it R11000 so that I can pay all the monies required. Everything was paid and got the car. The car was returned on 19th and all was in order. I waited over 2 weeks for my deposit to be paid back after following up I received only R5200 which my bank had on hold. Went back to OR Tambo to query the remaining deposit amount which,the manager forwarded the message to customer service which is not helping at all. I'm only having back and 4th emails with them. Ok so I'm requesting an invoice which shows all the breakdown of my expenses on this specific rented car for that period I'm still not assisted with what I need because their invoice only shows what I was charged after returning the car. Now to top it all this morning 29th April I wake up to a debit of R400 by Avis...I'm still waiting for the remaining of my deposit to be paid back and now more money is taken out of my account which I'm very much unaware of. Who's authorizing these transactions? Is Avis de*****ing their customers?