Vodacom Incompetance

I have cancelled a new cell phone deal with Vodacom Online earlier this year. I never took delivery of any new phone or simm card; the courier company returned the parcel to Vodacom and it was received back into Vodacom's warehouse. However, Vodacom went ahead and activated my new line and without having to Rica the simm card. Vodacom is now threatening me with legal action and blacklisting via their legal dept and 3rd party debt collections agency for a "billing issue" on their part. The last consultant I spoke to, Gugi confirmed that the equipment was not delivered to me and received back into their warehouse. The consultant also told me that the system "for some reason" automatically activated the new line resulting in billing me accordingly. The consultant then logged a call (ref. 1- ********** ********** ) with the backoffice to reverse the entries and credit my account accordingly. The turnaround time for this was 14 working days which have passed more than a week ago. Further communication with Vodacom and the debt collector has resulted in zero joy. Please help!