That doesn't sound right. I've contacted them via twitter multiple times (~ 10 times in total I guess), mostly about coin daemons being offline, and about some other stuff, and they've always replied within 24 hours. Last time I talked to them was not that long ago. I do agree that having twitter as the only means of contacting them is far from ideal, but that part about you and 6 other people being ignored seems very strange. Maybe it's the topics you're trying to discuss? You mentioned some coin listings, I suppose if they get a lot of requests for listing all those shitcoins made every day, they might choose to ignore some (or all) of those requests. But general support like daemons in maintenance, issues with transactions etc - those seem to get responses in a timely manner, at least in my experience.