****ming customers money

Why wasn't I told that I would have to call vodacom and cancel my contract when the contract is about to end. 2 of my contracts were supposed to end in July but didn't because I didn't cancel which I didn't know nobody told me that. So when I called Minenhle Mbatha answered she is asking for my Vodacom Account number which I don't know I asked her to ask me security checks so that she can see that I am the right person she said she can't and asked to call 082135 but that is the same number I called her on. If I was sent my statement monthly maybe I would know my vodacom acc number but I never received my monthly statement. Can anyone call me to cancel this damn contract!!!!!