Unfair listing by standard bank

Many moons ago i had a transactional account with standard bank- i then visited the parktown branch to close it because i had opened a cheque account. The consultant did confirm closure however years later i got harrassed by debt collectors regardless of me informing them that i went to the branch to close the account. Went to Standard back in Woodmead retail park, spoke to a consultant - again i was promised feedback till to date i see a listing on my credit profile. The lady at woodmead was pregnant at the time- took my details as well - i am getting emails from nimble. I want that account closed, removed from my credit profile- cause two consultants from standard bank have failed me.