ABSA has Access to me Funds without Informing Me

I have been banking with ABSA for around 40yrs.I have always been very happy with their service and have supported them in conversations etc. But the past few days have really dismayed me. I have without a permanent job for two years so money is extremely tight. I have been doing some short term contracts when available and I'm battling with severe depression that was diagnosed early last year making working even more difficult. I am currently working on a short-term contract, was paid R5k end of last month, and borrowed some extra money from a good buddy of mine to get me thru. I had paid my medical aid, and when I tried to pay my municipality there were not enough funds available. ABSA decided without warning, notice, communication of any kind to transfer R3k out of my account for another account which is in arrears according to them. So where does that leave me. No money available, even though I had borrowed money to pay for my municipal, cellphone, etc(only the bare necessities) and now I'm stuck. Went to my local branch but they can't assist or reverse the transfer as it is out of their hands. They did assist me in putting a request to have the money reversed, but obviously that is going to take time to resolve. What irritates me is the fact that ABSA can't do with your money what they want to when they want too, and that without your knowledge or informing you in any way. Again it is easier for other people to access your own money than what it is for yourself. Really not impressed with ABSA's service at this stage.