Horrible poor service

ABSA LATE ESTATE department worse service ever, they do not work in that department it's like everyone past on, the managers do not want to take calls they never available. Just to update banking details it takes them over a month just to to get back after they advised you the account is closed and you need to submit new account details. They never get back to you and always tell you to call back in a weeks time. I work in the banking industry and ABSA is the worse bank to deal with. I need my query sorted out and would really appreciate if they could wake up from the death and start helping clients