Misleading People and unauthorized agreements

A consultant assisted me to pay off my debts on the 20th of each month, now this is 3rd time you debited my account without my authority on any date not instructed by the arrangement, yet again my Discovery account has charged me R100 for unpaid debit order. I want you to cancel my debit order details from your system ,I will make an EFT payment from now on. I have all your details, i want to dispute my unpaid debit order charges . action this with urgency