Fed up!

I had 3 accounts with African bank in which i paid in full. I received a statement recently stating i still owe over R1600, which i then queried. For the past 2 weeks, way before i even received a statement, i have been asking African bank to clear my account and update accordingly on ITC but to date NO one is able to assist or give me a straight answer. All of their agents promise to call back but non of them do. I dealt with superviors who also cant keep their word. I've sent emails to 2 different Superviors and non of them even has the decency to reply to say they have received. I always have to call in and ask the status of my query and ALL their agents say the famous line \i'm forwarding this to my supervior to escalate