Unenthical and ******* Debit money from personal account,without discussing,notifying or any permission from my personal account

Have a agreement for last year and a bit with Nedbank Personal Loan on a loan made by me. Have full adhear to the agreement and paid the loan every month. Tried to trf money today from my account ,could not as it says no funds available,And I know the amount wanted to Trf is in my Acc. When I went into my account,I saw there where an amount of R8615,taken from my account. Then I phone Nedbank to report that there is a huge problem on my account,they said its for my personal loan,so I explained to them I have a agreement with Nedbank which they gave me,and I adheard to it every month,never skipped one month,only rep**** they will trf me to the correct dept,this went on from dept to dept...and at the end no one (Dept) could help me. Finally decided to log a call with there ***** dept,only to get the following reply from them...THE CORRECT DEPT WILL PHONE ME!!!! FEW THINGS I WANT TO KNOW 1. CAN THEY JUST TAKE MONEY FROM YOUR ACCOUNT WITHOUT ANY PERMISSION,AGREEMENT OR EVEN DISCUSSED IT WITH ME? 2. CAN THEY JUST TAKE MONEY FROM YOUR ACCOUNT IF THE ACCOUNT IS UP TO DATE PAID EVERY MONTH?? 3. CAN THEY JUST TAKE MONEY FROM YOUR ACCOUNT,EVEN IF THERE IS AN AGREEDMENT MADE,AND ARRANGEMENT MADE ON THE ACCOUNT??? NEDBANK MADE THE AGREEMENT TO PAY X AMOUNT WHICH I DID,AND THEY WENT LIKE A ***** AND ***** MONEY FROM YOUR ACCOUNT!! IF POSSIBLE CAN ANYONE REFER ME TO A OMBUDSMAN TO ASSIST ME WITH THIS,AS TO LOG A CALL WITH THE CUSTOMER CARE DEPT OR ***** DEPT IS POINTLESS!!