Bad service

I am not happy with the service which I am not receiving from ABSA. There is an unauthorised mandate on my account. I went to the branch and the agent said she cannot help me. I am utterly disappointed, I even called the ***** department which was the most absurd, I explained to the agent on ***** line and she kept telling me, maybe's, and that she doesn't know what to do, I asked her to transfer me to a senior and the line was back to square one where I had to select options. I am very unhappy as a customer with money with that bank.