Vodacom contract completed but no termination upon request

In June I called in to cancel a subscription to a mobile router line(contract had already ended) and I was told that it would be cancelled as of end of June, it wasn’t. In July I called in again…I was told it would be cancelled…at the end of August. I am still having the debit order deducted from my account. I want this contract cancelled and my money refunded from July and Aug