Debit order going off my acc and no one will help

For the last two months an amount of R144-00 has been going off my bank account, when I phone Capitec they say that they can't help. I did not sign a debit order for this amount, surely they have to authorize these payments and are able to tell me who it is going too. What happens if it is the wrong account that was entered and should not be going off my account at all. I really need to know what is happening and someone at Capitec can surely assist.