Refuse to refund

On the 20 December 2017 i phoned Tempest Car Hire for car rental VW Automatic unlimited KM from 23 to 26 and the lady who was helping me, she told me that the car that i'm looking for is at Sandton and i ask her if she can check it for me around Pretoria which she did and she gave me reservation number ( TSANB ********** RS0 ) she said i can get it at Hatfield. on the 23 i went to Hatfield for car collection, when i get there i found the lady by the name of Tshego , after she has done with everything and signing the contract. she said i must wait outside for my car. they bring me the wrong car which is not the one I've requested and i told her that is not the car that i have booked . and she said they don't have that car and i ask her why they gave me reservation number knowing that they don't have the car that i'm looking for. she said to me if i don't want the car she can cancel it but they wont refund me the same day because head office is closed i will get my money during the week which was R6111.85 and i say its fine cancel it . on the 27 they did sent my money back to my account , on the 29 they took it again . I went to the bank to find out whats going on. The bank told me that Tempest car hire took the money from my account. I've been phoning tempest from the 29 December until today i haven't receive my money back and every time when i phone i get a new person and i must start explain what happened and they will tell you we will phone you back and they wont phone. i spoke to different people Tshigo, Floyd , Mahlatse, Daniel ect , Managers and employees i even forgotten their names .