Very disappointed

I hired a car with Dolla Thrifty in King Shaka International Airport and returned it on the 25th of July 2021. I have not be refunded my holding deposit of R4000. I have called, emailed and told by one person (Mango) that they have backlog. I have also been told by Hayleigh Coetzee that My money was processed on the 09.08.2021 and should clear after 1-3 days which should have been on the 12th. Mango told me again to contact my bank and ask if the are holding the money which is not the case because my bank advised that Thrifty has taken the money which is not supposed to happen in order for the bank to release it. I phoned back to advise Thrifty about the banks update and Mango said she it transferring me to the refund gentleman and I got cut off. I've never received such a pathetic service ever since I started hiring car from other companies. This was my first time with this company and I must say it was definitely the last. All this sounds unbelievable and disappointing that after back and forth no one is contacting me to at least explain or send me proof of payments as they claim that money was processed on the 9th. All I was is my money, is that too much of a ask?