That sounds like email? In my experience with (German) council people phone is the way to go. Might take a while, but you’ll be able to make clear that it’s rather urgent, and you’ll have a name.
Planning enforcement should take this seriously. It sounds like quite the list of offences. As aggi says, councillors will be able to get on to the services from the inside, and obviously will be interested if it's in their ward. Good luck.
Building control, they will shut the site down.