Standard bank - payed up loan account still active

If I could rate them it would be 0. I app**** for a personal loan back in 2015, paid up my loan in 2018 already. I received lawyers letters in 2019 which didn't make any sense as to my knowledge the loan was paid up. I even had proof at the time. I went to standard bank personally to query this and one of the consultants had confirmed that my loan was paid up and she had said she didn't understand why it wasn't cleared up on the system she had assured me that she would clear it up and send me an email verifying this.

Today (18-09-2020) I checked my credit score with Clear score and it states that I have been missing months of payment with Standard Bank and that for the past two years my balance is R1491. 00. If that was the case wouldn't my balance be higher due to non payment and interest??

So because of this my personal life has to be affected. This is *******.