Me (in response to a press release about an upcoming event): Hi, Jason. I've asked a couple of times about who to approach at [the organization you represent] regarding advertising, but I never hear back. Any advice on how to proceed?
Jason: I can forward on your request to them again, but I don’t handle or work with anyone in their advertising department.
Me: Maybe you should tell them that it seems like I'll be more likely to mention these events if someone at least acknowledged my request. If that's how it seems to you, of course.