********** Debit Order - bank says they can not stop it!??

It July I notified the bank of a debit order I had not authorised that went through on my personal account on 14/6 and again on 15/7 for R109.00. After much begging and many emails, the bank eventually reversed the one from 15/7, but said it was too late to reverse 14/6. This same debit order went through again on 15/8 - same performance to reverse it, and again on 16/9. I PAY for a prestige bank account with a PERSONAL BANKER, Eunice Malotsa, who tells me that Standard Bank can not stop this ********** debit order as "they change reference numbers to get it through the system". This is totally untrue, the identical reference number is used every single month Subs-DJC***4. I got the name of the man and a KZN number from the bank - company name "Design". I have told the bank MANY, MANY times, IN WRITING, that the number does not exist and that this is ********** as I do not know this company/person and did not agree to this R109.00 debit order. Surely I am not expected to go into the App and reverse this debit order for the rest of time. If that is indeed the case, if Standard Bank can not stop this and investigate this person for *****, then please tell me, as I will definitely change my bank to avoid this monthly hassle. I have told Eunice that I intend closing my account if this debit order goes through once more, and I am not joking - I do not believe I get much benefit from this account and yet I'm charged a hefty monthly fee - perhaps it is time to change to a 50+ account?