contract cancellation

my name is lebo , I had a cell phone contract with Vodacom through Nashua Mobile. My contract came to an end in October last year and I decided not to renew my contract. I submitted my cancellation notice on the 7th of the month of October through fax. They told me that they could not cancel my contract as Nashua Mobile was discontinuing their mobile phones services and referred us to Vodacom I then called Vodacom and they told me that my last debit order would be taken in December to my surprise Vodacom continued to debit my account in Jan Feb and March this year. I obviously called them and they told me that my account details are with Nashua when I called Nashua they also did not have my information and referred me back to Vodacom because they also did not have my account info. This is wrong and ********** how can I be paying so much for a phone I no longer use!!! they are now sending me demand letters threating to take me credit bureau even when I call and explain to them my situation. I have call reference numbers dating back to October 2014 I have emails sent to me confirming my situation . <br> <br> Vodacom is filled with ******* and has low levels of ethical values. Sies!!!!!