Unauthorized limit increase

I went to an ackermans branch yo request my account limit to be reduced and they told me it was not possible, i requested to speak to the accounts department which i interacted eith a lady called bronwyne and she said she cnt help me i neef to bring 3 months statement. I requeted a complaints department and i spoke to Inam which couldn't help either because she doesn't deal with account complaints.... I don't know who increased my limit and now i cnt be assisted when i want it to be reduced. Can i ask ackermans to never increase my limit without my approval anf they should reduce the limit to the agreed terms.... Can i please get my statements since i had this account.