Account Updating

I have an account with Old Mutual that I'm currently paying after being given a discount however MBD doesn't seem to be updating the previous closed account I had and the one I'm currently paying . I have call numerous times to ask why this account isn't being updated on the credit bureau after i sent a paid up letter , I'm really struggling to apply for anything as no one seems to tell me who needs to update my information I called NCR they advised I must call Council for debt collectors who then said I must call MBD no one seems to know who know anything .and being sent from pillar to post . I just need my info to be updated