What more do I have to do?

My monthly Telkom debit order did not go off at the end of February 2016 due to a fault by me.<br> I went to the Telkom store in Irene and they assisted me in speaking to the correct people to find out how I can resolve this matter as speedily as possible.<br> At the end of the day I made an EFT payment that same day to sort out payment that did not go through.<br> Two days after making the payment, I received a sms message from Telkom advising that a double debit (30-days &amp; current account) will be debited from my account that very same day. As I can not afford a double debit order, i immediately again went to the Telkom shop to find out how come, as I did speak to accounts 2 days prior, and they said all is sorted. At the end of the day I had to go to the bank to reverse the transaction.<br> End of March my debit order once again did not go through - no fault of mine. I did an EFT as soon as I realized it did not go off again. Then the sms's started threatening me with legal action.<br> I phoned the billing department and ask them to look into the matter re the debit order. All was fine. Today again I received a threatening sms. What do i have to do to stop this harassment?<br> Please help.