Thrifty Car Rental - Cape Town International Airport - Terrible Service

Recently we hired a car from thrifty car rental - upon renting the car we were informed that it will be 7 working days for them to refund the deposit. Upon returning the car and getting it cleared for any damages - again we were told refund in 7 working days. That was on the 24th December 2017 - today is the 15 January 2018 and still we have not received it. After countless attempts phoning them and opening trouble tickets on their website eventually I got a response that because I am an international that it will take 21 working days. Never was I informed about this when renting the car, I did so with my foreign bank card and passport and drivers license. Furthermore, I have opened 5 tickets and all the tickets get forwarded to someone else and then closed without resolution - this service is poor and I will never use Thrifty again - and I suggest that internationals outside of South Africa avoid using them.