Carter South Africa treatment

Horrible treatment by Carter Melrose Lucia bought a brand new Renault Kwid Auto from Carter, she received the car on 02/12/2023. She specifically asked the sales representative Lehlohonolo khoele to put the first installment as 31/01/2024 which he agreed on and said he will ask for the first Installment to be the 31/01/2024 and said the bank might choose adjust it. The sales person Lehlohonolo made an error and put 31/12/2023. Now the bank called and are sending messages because they say she defaulted on her payment. She contacted Carter and Lehlohonolo, he acknowledged the error and said that he Carter will send R4500 to her so that she can pay Netbank. Lehlohonolo's manager send her a voice recording clearly stating that our agreement was first installment should be on 31/01/2024, The manager said it is the Netbank FMC who adjusted the agreed first installment date to 31/12/2023. She contacted Netbank FMC and they sent her the contract sent by Carter which shows that Carter made the error by stating that the first installment should be 31/12/2024. Even with the recording, contract sent to Netbank MFC by Carter Melrose, they still refuse to send her the money to fix this error,. This error by Carter is negatively affecting her credit record as they made sure that she default on her first installment. She is helpless now and don't know why they refuse to fix their error