You call up a person on behalf of someone else without the full facts and the person at the other end just shouts at you for no reason. Why do they do that? Its not the fault of the person calling them up that they do not know the facts properly since the person on whose behalf you called never bothered to tell you what was going on. Its annoying and frustrating to be that person who is being shouted at. Dude, don’t shoot the messenger, its not his fault; he’s just following orders. If you want, then go ahead and shoot the person on behalf of whom the messenger was calling. Or just be cool and say you will follow up with the concerned person later..its as simple as that.