PATHETIC SERVICE

I had a personal loan at Absa 13years ago which i have paid off, yet for some reason my account was never closed, rather passed on to the recovery department who then listed me as a bad payer on the credit burea! Now I have a horrid credit score that stops me from buying a house! Trying to get a hold of Recovery department is such a mission, each call centre agent gave me a different number, I have three numbers for the recovery department but no answer on ANY of them! Nice! so how do I clear my name please tell me?