False information to credit bureu

I had a data contract on a tablet with vodacom from 03 Feb 2017 and i cancelled and closed the contract on 25 March 2021. In the time I had the contract, vodacom had a debit order for the amount of R109, I never missed a payment . After I closed the contract the last payment was due at the end of March, which went off by debit order. Now after many months I realised Vodacom handed my account over to their legal department and sent non payment details through to the credit bureu for 6 months!!? So that caused me a bad credit payment record...which is totally FALSE !!! I contacted with vodacom and indeed they agreed that the account never should have been handed over to legal..but I still owe them .23cents..!!! Is it my fault they calculated the debit order wrong?? 23cents..unbelieveable!! So I paid the 23cents and requested them to set the matter straight and correct it also with the credit bureus..the person I spoke to also promised to send me documentation as proof that indeed the 23cents is paid and the account is closed. I am still waiting for the documents 2 weeks later..!! I am so discussed with the poor poor service...