Virgin Media are performing an installation across the road from me, which involves some external work, and this morning I've discovered they've dumped a large blue sack of (I think) cement or similar and a full rubbish bag in my front garden. I'm not a Virgin customer and I've had no contact with the workers, let alone given them permission to dump their trash on my property.
Where can I raise a complaint to Virgin regarding this as I'm not a customer?