clientele takes money out of my account without my permission then says it could have been a mistake

clientele has taken money out of my account via debit order o 23/08/2019 an amount of R85, I went for operation on this day so I didn't have the energy to call them, I called them today at 16:43 on *** the young lady I eventually go through to wasn't able to answer any of my questions and cannot track the ament with my account number, I informed her that I'm concern that they might tsk are money out of my account and she just told me she can't help me as she cannot get into my account. and that it could be a mistake. she then asked me for a payment ref number starting with 16 and when I gave it to her she said this not the one. I want answers from clientele, where did you get my banking details when I never leased with you guys in my life. Have you been taking payments prior to this? why are you taking money from my account? Eitherway this is ***** and you have no right to take any information from me without my permission, and as for that gent I spoke to, teach her to put her customers first and think about how they feeling rather than just saying you cannot help. I m appalled and afraid that if clientele decides to take more money out of my account ill just get the cold shoulder from clientele like I did today.