Tellkom *****ing money via debit order

I took out a pre-order mobile contract from telkom on the 23rd. I cancelled it on the 25th. I was told the debit order will go off on the 30th. It went off on the 25th after I cancelled. I have no reference number for the order, or for the cancellation ,and the brain dead things at the helpdesk keeps on telling me they can't do anything.

You farks are *****ing money and you confirmed that you can't do anything to pay it back, or even cancel the debit order, so you will ***** another R700 from me this month. That's very nice of you you farking *******