Overdeduction of debit order

I have now been waiting more than a month to find out why about R600 more was deducted from my bank in respect of my Makro debit order. Have phoned them on numerous occasion, e-mailed them on numerous occasions, placed more than one review on Hello Peter. They gave me some explanation that does not make sense at all, previous months my debit order was R1700, January suddenly R2400 and again in February it's R1600. I have asked how many times that they give me reasons why the original agent that I spoke to told me that it was a mistake made by them and that the difference would be refunded, to date they still have not answered this question. I think this is absolutely pathetic service and at the end of the day the agents and managers who are supposed to answer these question are giving Makro a bad name due to their bad service. A good example: I received various mails from a Ndileka on 8/02/2018 advising once again that a overdraft of R7 is the reason why my debit order was R600 more than previous months (totally confusing) - I asked her on more than one occasion why the original agent told me I would get a refund and in my last e-mail on 09/02/2018 I asked the above again and advised her that the attached statement (which I still haven't received) she was referring to in her mail was not attached. Once again to date no response has been received.