billing account

im really upset with discovery, I took a policy retirement policy and instructed that debit order should go off on the 1 like any other debit ordee that I have with them, last month debit order went of on the 8th of which I did not have money for that by the 8th besides if paperwork was only completed after the 1st I was not expecting for debit order to run for feb hence I sent an email asking whether debit order will go off. Im shocked this morning again to see 1000 out from my account and the date is the 6th who gives them the right to debit on the 6th . Can I rather cancel this and start on new slate because I can't just have R1000 go of without agreement its not that I missed last month they chose to deduct on their own date.