SANI Car Rental’s failure to refund my holding deposit

I hired a car in East London on the 15th Jam 2025 and returned it on the 19th Jan 2025 with no damages and I filled up the fuel. Their policy stipulates a 14 day period of reserving a holding deposit if you hire. They reserved R3800 on my credit card. The 14 day period has lapsed and my money has not been released. I’ve phoned and spoken to two different customer agents who promised to escalate the matter and it is still not resolved. I don’t know what to do anymore as they have not comp**** with their policy and no one is even bothering to contact me and explain why I’m not getting my money.