Unfairly blacklisted

I tried applying for a loan and i was told that I'm listed in credit bureau, today i requested my credit record from Transunion and Experian and they both show that Edgars (edcon) listed me there as my account is in arrears for 9 months yet when i go to the store i don't owe them anything according to the system because i made a payment that was outstanding. When i called customer care they said they haven't updated my payments on ITC since 2014 yet they know how to update it when i skipped a month of payment. They saying its my fault that i didn't't ask them to update my payments on ITC, apparently i was supposed to be the one telling them to do the update