Unauthorized debit order change

Hi, I got debited by Telkom on a day which I didn't request to be debited on so I decided to call their billing department to find out who changed my debit order date to the 20th. I spoke to a consultant named Ntokozo Cele from the billing department, I asked her to check who made the changes on my debit order date she first **** to me saying she is unable to check, I had to really persuade her to check and she finally did saying that a consultant with a name of Siphesihle Tswasa left those notes that I get debited on the 20th of every month of which I didn't request for that. I asked Ntokozo Cele to provide me with her manager's name and surname she gave me the name of Tshepo, I asked her for his surname and she refused saying she is not allowed giving me the information, I asked her why as I am a valuable customer for so many years and seek the matter escalated she still refused. I am tired of the incompetence of Telkom staff and services. I request that this matter is looked into. They treat customer as if we are getting their services for free. I require an urgent call back please. From Nonjabulo Nombuso Ncwana