Appalling Service from Experian

I am absolutely appalled at what should be an institute in South Africa that maintains our personal credit records. Firstly I logged a dispute on accounts that were closed a long time ago (some dating back 2 years ago), and Experian has not adjusted anything. They say it takes 20 business days according to the NCA to clear a dispute. That time has since past a long time ago. I tried getting hold of them today, waited for 47 minutes (from a prepaid phone), for someone to answer eventually, only for her to slam the phone down on me (this seems to be a habit for them as it's the second time this has happened). In the interim, your personal credit record is adversely affected, and quite frankly don't think Experian cares. Unfortunately for poor consumers like myself, Experian's data is shared across other Credit bureaus like Compuscan etc.