RTC and Pick n Pay - DO NOT OPEN AN ACCOUNT!

I settled and closed my Pick n Pay store card account in 2019. I was in a credit but was charged interest for having a credit balance. After months of arguing with *********** agents, I finally paid off the erroneous amount just to get the account closed. Now in 2021, I have been placed on ITC for an amount that I DO NOT OWE!! I have the last statements as well as screenshots from the app showing that I did not owe a cent. The ITC report shows that I settled the account. Why is RTC then erroneously opening up an amount that went from R159 to over R1300??? I have had NO communication from Pick n Pay or RTC since 2019! Now this gets picked up when I apply for a further lending loan for home improvements! Was RTC going to just let this snowball??