placing debit orders without consent

since i have been with zone fitness, numerous debits have been set on my account at random times and days,no one has spoken to me about it. As far as my understanding goes, you guys have no right to set debits without my consent. I have incurred more than R 500 worth of bank charges, which could have gone towards the fees owed. <br> I'm very disappointed with the way your accounts department handled this matter, and it will not be left this way.