Disgusting customer service, Multiple Debits, ********** transacting!

I hired a car on Friday the 11th of October at Cape Town International Airport. I assumed everything went well until i got to my accommodation and i found out that they had debited my credit card twice for the same amount. I had to return to the airport (72km round trip) as their lines were not being answered and i needed the funds they had debited.I was met with the most atrocious service. The supervisor Maxine actually told me to contact my bank and its not their problem when they had prompted the debits. After some argument i convinced her to contact their bank and rectify this and i was told it will be rectified within 5 working days. Dejected i drove back and today - the 5th working day after the car drop off not only has my money not been released back to me - A FURTHER DEBIT WAS MADE OF THE CAR HIRE FEE!! This is 3 debits for one car hire and my two holding deposits are still being withheld. What type of disgusting service is this? You are fleecing loyal customers. Isn't this *****? Please give me back my money which you are still holding on to without reason. I received my invoice on Monday 14/10/19, you had finalised my account. How will i ever be confident to use you again. Use Avis at your own risk - risk being fleeced. Pathetic