NEDBANK ALLOWED ********* INTO MY ACCOUNT!!!

My recent experience with Nedbank has left a sour taste in my mouth. About 2 months ago I noticed an unauthorised debit order from a company I've never heard of. I reversed the debit(at my cost of course) I went to a branch and they gave me the details of this company and they said I have to take it up with another bank which this debit was coming from! Went to the other bank and was told that the account is not from their bank and must take it up with my bank(NEDBANK). The debit went off again and I reversed it and blocked it but it went off again. I called their *****s line today and they told me they cannot help me but debit order department should deal with the matter. They allowed ********* into my account and they shifting the blame to me and veryone else but them. Seriously I've had it with this bank.