as others have said you will be messed about with apologies and no more - staff on here have no authority other than to refer it to the area manager who is liklely to ignore any request to sort it
you are very much in the middle - the wire cutters are your only reasonable solution but that then puts you at odds with your neighbor - he will report a fault and they will solve that in due course - the likely solution will be to repeat the original install
all fun - well not really but thats how its likely to go
your only other option is to go legal - how that would play out is anyones guess as [again] VM are likely to ignore such things - their interpretation of the law is always interesting as you have found already with illegal trespass