INCORRECT CREDIT REPORTING BY CAPITEC!!

My wife took out a Capitec loan account with an access facility. The first installment was payable in December 2020, Installment went off without a hitch, and has been been going off ever since, however, Capitec listed my wife as a slow payer and they say that she is in arrears with her first installment, this has seriously damaged her credit scoring, and when she raised a dispute, apparently only Capitec can sort this out. So we went to Capitec low and behold there is nothing they can see on their side all is in order with the loan account, payments are made up to date. We are at our wits end, who do we turn to. Please sort this out Capitec, we are at your mercy.