Confirmation of Cancellation of Contract

<p>Every time I have called Vodacom, they tell me that they are offline. I phoned weeks ago to cancel my data contract and all I want to do is confirm that this has been done so that I won't be charged at the end of the month. They can't phone me back and instead I must phone again or spend more time and money going to a shop for service. I would really love it if someone could just help me with this instead of the response "there is nothing I can do". </p>