Have you or someone in your house opened the Netflix App on your TV box to watch something? If so it will trigger the payment. To stop the payment, please log into your Netflix account via a browser to cancel the subscription as we cannot do this here.
What you suggest is the likely cause, I have already been able to get Netflix to cancel the DD from my current account. Will try and cancel the VM payment as you suggest as we don't use Netflix enough to justify the cost .
How are you supposed to access Netflix on your STB without this happening?