Rip-off from Cell C074

This giant company is costing me money, they are debiting my account without my permission. To make things worse they go into my account on different dates and use different reference numbers at least that's what my bank is telling me. I pay R70.00 for rejected debit orders, even my bank cannot put a stop to this malpractice. Can someone put a stop to this rip-off because this doesn't stop, you could hardly make sense calling their "call centre" no one ever comes back to you. I have asked for a recording stating our agreement for a debit order, to no avail. This has gone on for far too long, I want these people to be exposed cause you may find that am not the only one. They make sure that you are in arrears deliberately. I need help to this regard and I want my money back as I have never skipped any payment.