Failure to refund my deposit and unauthorized debit

On 25 March 2022 I hired a car from Hertz in East London and returned the car on 28 March 2022. I filled up the car at Engen garage and dropped it as per Hertz’s standard operating procedures. I then gave my petrol receipt to a gentleman whom I cannot recall his full names and same guy who checked the condition of the car. To my surprise an amount of over R1K was debited by Hertz from my cheque account. I then called a few days later and someone promised to revert back to me which he failed to do until to-date. My deposit is still not refunded by Hertz including the money which they debited my account for. This is the third month now wherein the person who assisted me with the car promised that I would be refunded my money back within 21days maximum. Today is 13 June 2022 and I have not seen a cent from Hertz in my account. This is unfair, inexcusable and pathetic 🥲💔🙆🏿🤷🏿♀️🤷🏿♀️🤷🏿♀️