Impossible to cancel 3G ****le

I have phoned the cancellations department multiple times to cancel my ****le, which I no longer have as it was ****** while at a conference. Every time they promise it will be cancelled within the day, but nothing ever happens. This money is still being deducted from my account each month, its now adding up to over a R1000 for something I don't use./have

Vodacom obviously just wants to take my money, against my will. And I'm at their mercy. Surely this is against my rights as a consumer. I demand for the ****le and debit order to be cancelled emmediatly