Congratulations! Of all the photos of totally ridiculous VM cable installations that have popped up on here, that one is definitely right up there near the top of the league of shame.
With the photo to look (marvel) at, the VM forum team should be able to refer to a local VM person to investigate and arrange a remedy. Shouldn't cost your neighbour anything.
These topics of unwanted cables on (or flying over!) private land do usually get sorted on here but it is often not a quick process. You may have to keep referring back here to chase it if VM drag their heels on fixing it (which is quite likely they will).
One of the VM forum team should reply and help within a day or two.