No explanation for unauthorised debits.

We received a statement on our account which reflects an amount of R60.00 being debited to the account for the past few months. When we queried the debits, they advised they will investigate, still no explanation received. We also requested an updated statement showing that the debits have been rectified. I was informed by Yvonne on 22 November 2015 by email that she cannot provide me with a statement now, only on the 9th of December. Today is the 14th and we still have not received the statement. How can you just start debiting your customer's account with R60.00 per month without the necessary permission. A money making scheme, which is totally ********* and unacceptable!!! I still want an explanation as to why our account was debited.