As planning permission has already been granted and the box is already in place, then the ability to challenge has been lost, you will need to speak to the council with regards to that.
The green boxes are placed in what is deemed as the service access area, and if you require it to be moved etc, then VM can arrange for a survey to be done at your cost, to allow them to tell you what the costs of moving the box will be, this will be at your cost and seen other posts where this runs into 10's of thousands.
Do you know if your drive has been extended and also how long has the box been there, i.e. was it there when you moved in.
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