unauthorised debit order

I've had an unauthorized debit order coming out of my account for months. it appears on my statement as: "Absa: CHEQ4364, Sch t, 29/09/17 SETTLEMEN/C NAEDO TRACKED DO, STOK VH / ********** 544083..." i googled this transaction and it appears many people have the same problem. i can't reverse it on my online banking as it does not appear. i called ABSA and spoke to a consultant Ezra Swanepoel who was not at all helpful, he gave me an invalid number to call and inquire about the debit order. i am now back at square one, not knowing who's debiting my account, why, and unable to cancel it. i do not understand why ABSA is allowing some dubious company to debit my account without my authorization, and why they cannot cancel it with my authorization. this is completely insane. i've been an ABSA customer for 10 years and this single event is making me want to switch and move all my 6 accounts to another bank with better and more effective service. i'm extremely frustrated!