Online upgrade horror, continues

I have recently (well 3 months back already) done a online upgrade, which after 2 months of struggle and phone calls eventually is active now. However, a Contract cover Insurance has been added to my monthly bill, something which I never asked for or agreed to. To make things even worse, it seems that no one can cancel it - not Vodacom, nor Cellsure. I have spent more than an hour on the phone with both of these and to date have not been abled to get this cancelled!! You cannot charge me for something that was not part of the original agreement!!