Refund of deposit

In October 2019 rented a car at PE Airport. That process was great and no issues. Friendly and helpful staff. Problem came in that the R4000 security deposit was deducted from my credit card and not refunded. Numerous calls to their call center has not resulted in action taken despite promises they will look into it. To date probably have called them about 7 times, last time nobody has actually answered the phone. Also no response when sending a query via the email option. There is also no number for their head office on their website. I am thinking about lodging a ***** complaint with the bank.