DOUBLE DEBIT DRAMA!!!!

Yesterday, i got a call from the call center for payment. My response was that this was not my problem as i signed a legal document at the beginning authorizing a debit on the 27th of every month. The duty is on your institution to collect the money. The lady asked if there are funds available to which i rep**** yes, to which she responded with confirmation that the money would be debited. A few minutes later i got a call from a man whom i told that i had just spoken to a consultant now. He said he knows and that he was calling to confirm. In short, my normal installment of R1287 was debited yesterday. This morning when woke up, a further R1291 was debited. When i called the call center i was told that i authorized a once off payment. Recordings will show that all i was told was that the debit will be arranged, NOT that more money will be taken!. The lady then told me to check whether it was successful and then to reverse the payment. When i go back to my banking i notice that the payment was reversed but i was charged by my bank because it was unsuccessful. I had enough to cover my transport costs for the rest of the month, Now i' m short. the same thing happened last month!!!!