Bad service at Nedbank

I have 3 accounts with Nedbank of which I called to make arrangements during the 2months of no income due to strike in my company. All these accounts were up to date prior to the strike/no salary for 2months. I called the bank to make arrangements during the strike and in my resume to work. The recent arrangement was that I will honor the payments in 3months to make them up to date and was given a reference number ***, however the second the funds apear in my account they are being debited straight away. Right now I was debited twice on the 2 accounts in 1 month and full amount was also debited which is not what was arranged. I made arrangements with the bank because even after 2months of no salary, I will not get a full salary in July, however the money was debited anyway. While calling the contact centre again I am advised the funds cannot be reversed. I need them reversed as I had made an arrangement with the bank and this is inconveniencing my finances now. This is the third time this is happening with Nedbank and I am very unhappy with the incompetency service I am getting.