Telkom Contact Centre

My Debit Order was unpaid for end of November 2018, for R475.42, it was my first time to have an unpaid D/O. I went to make a direct payment of R510 on the 1st of December 2018, it reflected on their side on the 3rd of Dec. On the 10th of Dec, I received a message saying that my account is behind with R475.42, when I call the contact centre, the lady told me that the amount of R510.00 is reflecting on their side, the account was with the collection, she will send an email to them to close the account on their side because the account is up to date. On the 18th of Dec they decided to debit my account without my concern, according to my knowledge, they supposed to debit on the last day of every month. My cell phones lines are suspended on the 21st of Dec because my account is in arrears. I'm so angry with Telkom, my account was not in arrears. I paid R510 directly to catch up with payments. My account is up to date but they decided to debit on the 18th of Dec without my concern, what if they were no funds on that day? Why did they took my money on the 18th of Dec without my concern and after doing that, they suspend my account? I called the contact centre, I spoke to Nkosikhona Mlaba, he could not answer my question. I asked to speak to his Manager (Lungi), he told me that she is currently busy on the other line, she will call me back after an hour, I called at 13:00, I'm Still waiting for her call. I'm very disappointed with their service.