Unfair credit score update

I a extremely unhappy with Nedbank handling of my credit score. I had fallen behind and I was in arrears which negatively impacted my credit score, however I've full paid my arrears to rectify the situation, I was paying extra lump sum cash where I was able and made an arrangement with them to increase my monthly installment last year November, I did as promised. Despite my effort to resolve the issue nedbank refuses to update my credit score instead they sent me a letter stating my balance and that they acknowledge the arrangement I made to pay extra amount effective from 25/04/2025 which is not true the arrangement I made with them was effective last year November 2024. I have contacted them multiple times they said it's their policy not to update even if the arrears are fully paid. This policy is unfair especially since I have taken a responsibility for my debt. Im concerned that this Innaurate credit score will affect my ability to secure loan or credit in future. I urge Nedbank to reconsider their policy and update my credit score to reflect my current financial situation. I hope sharing my experience, others will be aware of this issue and take their business elsewhere