Which email addresses are you using? I'm always redirecting people to the official contact emails who have sent messages to DLRP Magic! thinking we're official (despite the millions of warnings on the contact page). And yes, if I'm honest, I'm sometimes not sure whether they'll get a response. (That said, I'm bad at replying, but then I'm not a 12,000-strong company).
I have noticed in the past a difference between dlp.guest.communication - which once seemed to be picked up by WDW (either that or for English guests they're merged and just favour WDW in their email signature) - and dlp.communication.visiteurs - which seems to take longer but you get an answer direct from DLRP.
When they reply, however, the answers are always so friendly and helpful.