Vodacom ***** and theft

I cancelled my Vodacom account in 2015. Since early last year, Vodacom started taking money off of my account without my permission. after endless phone calls to Vodacom, I eventually found out that TWO accounts have been opened with Vodacom in my name WITHOUT my permission. For over 8 months I have been sent from pillar to post trying to cancel these accounts. People have assured me that they have been closed, only to find Vodacom taking money off of my account again the next month. I have reported it to every section Vodacom have, and still nothing has been cancelled. Vodacom are still trying to take money off of my account and I am yet to hear from them regarding these account cancellations...yet, yesterday I received a call from Vodacom telling me that "my" account is in arrears. Vodacom are quick to call when they want money, but useless when it comes to paying back money that they have ****** from me.