Deposit not refunded

I rented a car at Thrifty Lanseria from 28 Nov - 3 December. I paid the deposit of R6000. Upon return of the car the sales lady stated it will take 14 days for deposit return (note the 14days was not mentioned during initial car hire) On 28 December the deposit was still not returned. After phoning Thifty the sales agent informed me that it was still pending and that the agent at Lanseria did not process upon return of the car. The agent stated that the deposit will be returned within 24-48hrs. Now on 3 January the deposit still hasn’t been returned. This is poor service where as one has to constantly follow up. Till date no deposits returned. I have rented many cars in the past. First and last time with Thrifty.