my experience in business communication has everyone responding, sometimes to the point of being overly solicitous, when things are going swell. but as soon as there's a hint of a problem, folks shut right down and make believe you don't even exist.
just as everyone wants to be your friend when you're riding the crest, but it's the guys that step up when there's a problem that have my respect.
I've gotten 2 calls from suppliers (jack @ model round-up & norm @ replicas and miniatures) because what I ordered was not within arm's length, and will continue to do business with them as long as they'll have me.