Poor service by ABSA

Good day I owed ABSA an x amount because I had taken out a personal loan. They gave me a discount of 50% on the amount, which I paid in full towards the end of July. But I keep getting statements from ABSA that I still owe them. The latest statement is dated 17 October 2020 - still claiming an outstanding balance. I've tried calling the Personal Loans department - without any success. The phone just rings and rings. I even went to our local branch, but was informed that only the Main Branch (i guess in Jo'burg) can assist me. I have the evidence that I paid the discounted amount in full. All ABSA needs to do is to send me a paid up letter that says the account is settled and close the account. Does it really take almost three months to do that. To make matters worse is that they reported me at the Credit Bureau's. But I now want to remove my name from the credit bureau for this account. They used to call me constantly when they wanted their money - now that I have paid them, this is the treatment I get. I'm a very unhappy and dissatisfied customer with ABSA and would not recommend them.