Bad Service

In October I called Vodacom to cancel my contract, I was told that it was cancelled then I did a premature cancellation on my other number and I paid my account in full. Now I keep on receiving emails and sms claiming that I am owing vodacom and my account is arrears, Just now i recieved a call from charmane claiming that she is not selling me anything, she wants to convert whatever, I told her that I am not interested. Her response was your account is in arrears and you not due for an upgrade Soooooo RUDE I want to know why I am owing Vodacom.