ITC not updated

I have R955 in arrears from Cotton On that dates back to 2019. However, I have paid the closing amount to finish and close the account in July 2021. Please can you remove the arrears to reflect an accurate reflection as it is negatively impacting my credit score? To date, my ITC has not been updated and I've been referred to numerous people to try and resolve this without any effect. I have phoned Cotton On and RCS as well as emailed both accounts, however, with no response yet. Please assist.