I've tried these people on 3 to 4 occasions in the past, even when tipped off by an insider, the only response I got was achieved by phoning and was completely unhelpful, made me feel like I was intrusive. My rationale is, if I take the trouble to contact you, have the decency to at least acknowledge receipt of my effort, or I will call you.
In better times, if they ever happen, well, we can all be selective.