Stop debiting my account

A year ago a manager who has been dismissed for ***** as many customers complained that he activated contracts without their knowledge was charged with ***** and I was the victim , shocking enough Vodacom dismissed him but they continued deducting my money, I sent everything to the ***** department up until today nothing has happened, I have been sent from pillar to point. Can someone explain to me why my query is not resolved. I'm personally stopping the debit order as no one is willing to assist me . I will take this up with the law as I have been trying to resolve it and no one bothers to give me a solid feedback