Debit Order not reversed

I first picked up around March this year that an amount of about R999 had been removed from my account. I was advised to do the reversal at my nearest branch so I went to Davenport filled out forms and was told it was all sorted. I kept checking my balance and still no refund. I went back twice and spoke to the same young Indian man who was very friendly and helpful. both occasions he told me that the Supervisor would sort it out. I also requested a call back via Facebook's RB Jacobs and he did relay the message to the relevant department but still to date no feedback and no refund. Please advise how we are going to resolve this matter this is completely unacceptable!