Money deducted from my account

I have money that was deducted from my account twice and when I called Nedbank for assistance they couldn't trace it at first. I was sent a dispute form,filled it in and sent it back. I was told my money was reversed, it should reflect within 2 to 3 days and that never happened. When I called again I was told it was rejected because I have a personal loan with the bank and they never received my August payment. So there's something called a what what calculated, it automatically deducts any amount it finds on your account. My question was, how possible Is that because even before I could have access to my salary, Nedbank would have deducted already. I was told they can't see the payment for August on their side so I need to send my statement with the deduction reflecting imagine a whole Nedbank that has access to my account? I have been trying to send the statement with no luck because all the email address I was given comes back to email address not found. The last consultant I spoke to was Jabulani over the phone and that was friday. He glandly said to me, I must call them Monday to see if can my matter be resolved.Finally I went straight to the bank yesterday and guess what? I was told there's nothing they can do on their side. I must continue contacting the people I have been making contact with. This matter has been dragging the whole of December till now. Schools are opening,I need money for my kids and yet Nedbank is not prepared to assist me with my money for that matter. One bank I never thought I would experience such. I can't wait to pull out and experience with other banks