unauthorized debits orders

I have been using ABSA ever since I was a student, but then for the past 4 months my account was been used for unauthorized debits orders that I didn't know about, the refs for the debit orders where from Telkom, Vodacom, Markams. to the value of R3000, R1500, R2000 respectively if I recall. I was always reversing the debits orders every time it happened but then decided to change it cause every time I have to go to the bank and do a reversal on my account. I went to the branch 4 Months back to inform them of my closure of the account but then they told me that I should call the Head Office as this might be ***** or a **** and that charges were already involved on my account and I was told that I have to Pay for all the charges incurred on my account , but then I always called the Head office informing them of my problem but then they always referred me to branch, branch referred me to head office on so forth, vice versa. Every month end and on the 15th they always call me to pay for all charges I don't know of. This is frustrating as I told them of my Problem but then they refer me to others and so forth.