VW financial services does not want to refund me my money

Since VW financial services is not verified I will just rate Wesbank itself. So I bought a car via finance in 2017 and it has been settled during the course of the weekend. The settlement amount included the debit order fee of more than R3200 which I pay and had just been debitted from my account meaning that I have now paid more than R3200 more to VWFS. Today 31 October 2023 I call them and Mbali answers, I explain everything to her and request the difference and refund. At first she did not provide the difference until a point where she requests for a proof of payment eventhough she can see the transfer from her side. I then ask her what will happed if I can not provide the proof of payment as I have sold the car to a dealer then she says then I won't get my refund eventhough they can see the payment from their side. They act nice and stuff when you finance but now when you finish paying it's something else