Incorrect Information on my credit report

On trying to re-new the lease on my apartment, I was advised that it showed that I owe Edgars R6044.00. It shows very clearly that this amount is UNPAID AND OVERDUE. This is incorrect, my account was settled in full over a year ago! on 13 January I contacted Edcon, and was advised by Albert Sithole, a customer services administrator that they cannot change incorrect information on my profile! He acknowledges that my account is settled and that the information on my report is incorrect. According to the FCRA the information provider (Edcon) has the responsibility to correct inaccurate/incomplete information. I have requested that Mr Sithole get a manager to call me urgently to sort this out, in the meantime I could lose my home as my lease will not be renewed if I have this incorrect information on my credit report! It is now almost one month later!