Who you gonna call?

I've focuses a lot on the paranormal creatures but not on who catches them when things go bad. What happens when humans are having problems with ghosts, vampires, werewolves, goblins, etc... Some books have the people plagued with these problems taking care of it themselves. Some books have the heads of these groups taking care of things. Few books have people you can call. This always strikes me as odd because even in the real world there are groups that study paranormal activity in a scientific manor. I wonder what you would pay for removal of a ghost or ghoul?

Well have a nice day everyone.