wrongfully charged penalty fee

I have asked for vodacom to resubmit my payment for the 13/01/2015 since D/O had bounced on the 29/01/2014. I was not advised of penalty charge of R100, nonetheless, I let it slip-by. On the 13/01, after about 12pm, I realised the debit order still hasn't gone through. I then decided to do an EFT payment on the same day. To my suprise, I was charged again another penalty fee of R100. I called to dispute the R100 charged on the 13/01. I was advised that they will log a request on the 26/01. Until today, no response I have received. I need the R100 penalty fee to be reversed back to my account. <br>