Telkom claims I still owe them

On the 5th of September I received an email indicating the I owe Telkom an amount of R1 189.12 on account number ********** 54614. I received this email from Telkom's Marlene Volschenk (Service Representative). I responded and stated that I do not owe Telkom anything as I had indicated to their call centre agents that I would like my service terminated.

Since then I have not received any feedback from Marlene or anyone at Telkom. The next thing I see is two debit order transactions from my FNB cheque. How on earth can Telkom set up a debit order against my account without my permission?