Unauthorised debit order

This is the third time I have lodged a compliment due to you not adhering to my debit order date. Last September I notified you that my salary date has been changed to the last day of the month. My account was debited early in October, January and again now in March. The clueless and condescending consultant told me that the way debit orders work is when there is money in my account, they will debit. Keep in mind, none of my other debit orders go off early when I have money in my account. So in fact, Makro is the problem. In January when this happened, the 2 consultants told me they will 'investigate' and get back to me, and I am still waiting and clearly they are still 'investigating' since this has happened again. Since a contract works both ways, and I am the only one sticking to the agreement, you no longer have authorisation to debit my account, and someone in a more senior position who knows how to do their job can contact me and can come to an arrangement that actually benefits me.