Account settlement

i'm so frustrated with Ackermans i called them on the 11th asking for a settlement amount on my account as i would like to close the account the gave me the amount of R1609 and i made payment immediately i then called them this morning to ask to close the account for me as i have settled the account they told me they will not close the account as there is still an outstanding balance and me very confused asked this young lady how can there be an outstanding balance when i called and asked for a settlement balance and then made payment so why is there still a balance then what was the point i'm calling for a settlement amount to SETTLE the account and then there's extra charges i asked the lady why didn't the man who gave me the settlement amount add the extra costs in. according to the NCR when a customer calls for a settlement amount the given amount is valid for 7 days before any additional costs is added and i made payment immediately i am still waiting for the manager to call me as i want the account closed!!!!!