Cancelled and expired contract still being billed

<p>I had a contract with Vodacom that I cancelled in April last year. they debited my account 25th May 2016 and my account went onto prepaid. I am now receiving calls from CreditWorx saying I owe Vodacom money. I contacted Vodacom customer care and their subscriber collections, who have yet to help me. As far as I am aware, I do not owe Vodacom any money, as my account is now on prepaid, and my last debit order went through in May 2016. What am I being billed for, on a prepaid contract? I did not receive a call, email or sms saying my account is in arrears till date and was handed over.</p> <p>The subscriber collections department are extremely rude, and keep cutting the call in the middle of the conversations. No one has been able to properly listen to what I am disputing and are saying that they are unable to help me.</p> <p>I am being billed for +R1800 and I do not even know what this is for.<br />contract number: I ********** 9</p>