Non emergency or ranger ?

Would you call the non emergency number or ranger for a welfare check in a unit when you’ve not seen the neighbour for a couple of weeks, and there is a biblical amount of flies at the window? I mean they could have just gone away and food has been left, but I’m not sure?🤔

Edit: sorry for the slow update! Police have just left, no body (luckily) but loads of blow flies, they thought they’d be a dead body when they entered. They’ve gone to make further investigations. They said calling them was the right thing to do 😊