Account wrongfully in arrears

I paid my monthly installment for May and then later received a sms that my account is in arrears that I still owe the R52. I immediately phoned them to find out why they say my account is in arrears. Then they said it was annual admin fees but it was wrongfully added to my account and that they wil make a note on their system to correct it ASAP. I then got a call from them that my account is R52 in arrears on which I told them it was a error on there side that needs to be fixed. On which they rep****: They don't see a note on the system but will escalate this error to the financial department so they can correct it. And because they did not correct the error on my account on time, this coursed a negative effected my credit score! I received my account statement for June 2023 and they corrected everything but I need them to please correct my credit score as well now. As it was their mistake that caused the negative impact on my credits score. I already tried doing it myself but had no success 🙃