Excellently Poor Service

I have unsuccessfully tried to block a third party's internet banking access to my business account. My first attempt to rectify the situation was two years ago, when I was told that Absa does not have a way to find out who the third party is that has access to my account. This was conveyed to me twice since. Through my own investigations, I have since figured out who could be having access and how they could have gotten access. I am not able to find anybody that can assist me at the branches. Apparently it is only the business bankers that can assist me, but nobody could tell me when there will be a business banker at the branch, as they come and go at uncertain times. The call centre cuts me off after 15 minutes of waiting. Yesterday I was busy discussing it with an call centre agent and at the 15 minute mark of the call, i was again cut off. Although the person verified my identity, as well as the reason for my call, it seems that my issue is not important enough for Absa to contact me. It seems that Absa is waiting for me to call back, and wait 15 minutes to maybe be connected in time, and then get cut off. They only got a star rating because that is the requirement to write a review.