Debit order deductions

I usually have no problem with Telkom. Have been using them for years without complaint but in the last month the have deducted a debit order twice, to which I have to pay a banking fee, I paid the outstanding amount for the month and they charged me with another month which they have deducted 3 times, to which I also have to pay banking fees with every deduction. I have been trying to contact them without success. I have also tried to stop the debit order but it doesn't even show there is an debit order active from them. It is almost Christmas, I have presents to buy and a family to care for and I have nothing to show for it because they keep on deducting ignoring my numerous request for them to call me back and for trying to contact them.