Oh Vodacom, so infuriating!!

I have been trying to cancel my contract with Vodacom for over a week now and firstly why do clients have to cancel a contract that has already ended? This makes no sense whatsoever!! This process is very frustrating and infuriating, to say the least. It seems like some convoluted way to make more money out of people. I have been sent from pillar to post, given one story or another. No Vodacom!!