Debit orders still continuing

I've successfully ported to Vodacom directly at the start of December 2014. Since then I have no longer been a subscriber/member/client of Autopage and have on numerous occasions asked for my previous contract to be cancelled but I am still being debited by Autopage for an Amount of R423.50 on the 30th of each month since. This adds up to an amount of R2117.50 that Autopage now owes me. After numerous phone calls to the customer service call centre and logging complaints/queries on their website, my account still hasn't been closed and the money is still deducted from my account and no refunds have been made. I need this sorted out immediately.