Vodacom **********ly debits wrong account then my account goes into arrears!!!!!!!

Ive been a Vodacom client for many years. Last year I changed banks. All my debit orders went through every month then this year July they started debiting my OLD account that has been closed for over two years!! I DID NOT GIVE ANYONE PERMISSION. I sent proof to their legal department that my debit orders have been going through on my NEW account before VODACOM CHANGED MY DETAILS without my permission - IT IS *****!!!!! I DID NOT CHNAGE MY BANKING DETAILS!!!!! NO one at Vodacom is taking responsibility for wrongdoing. I have spoken to MANY people at VODACOM and everyone has a different response. I WANT TO CANCEL MY ACCOUNT!!!!!!!!!!! VOADACOM is ***********!!!!! I went to a KIOSK where they said I can cancel the contract as its on a month to month basis after the status of this account has changed. I phoned yesterday and again it must change before I can cancel. TODAY the story changes!!! VODACOM is a thieving company that *****s peoples money and that makes changes to accounts without the clients authority!!!!!!!!!!!!!!!!!!!