Wrong Information

I spoke to a lady by the name of Debra or Debbie yesterday at the Head Office I told her that I have a settlement letter and I couldn't pay it yesterday so she spoke to her manager and the manager said it will be okay if I pay it today on the 5th April 2016 so today when my mother went to settle the account they told me that they couldn't accept it as it was not valid so why did this lady told me that it will be valid for today but the branch gives me a different story, I will not pay any additional cost relating to this accounts because I was given false information from someone in your office. I've settled the 2 accounts that I have with African Bank on the settlement letter that was given to me and Debra or Debbie told me it will still be valid for today. But Nicholas gave me a different story and the settlement amount went up by R200 how can that even be possible?????