Vodacom is useless

I have been having trouble with my Vodacom account for several months. Firstly I am not unable to login to my online portal. I then phoned to have my contract upgraded, and after 4 weeks nothing has been done regarding this upgrade. When I finally decided to cancel the contract to to my hassles with them, they would not allow me past their security questionaire because I don't know what exactly the package I am on is called, eventhough I have provided them with all my other details. Could someone please assist me with getting Vodacom out of my life!