You called this person’s manager?!! After he didn’t response to one email? Why? Are you trying on purpose to piss him off? No, I don’t find that good business etiquette at all (much less “perfect”).
First of all, you didn’t say how much time went by between the time you sent the email and you didn’t get a response. A day? A week? A month? Let me suggest something to you: perhaps doing business with you right this minute isn’t the most important thing on this person’s agenda right now.
Personally, I don’t think you stand a snowball’s chance in hell of ever doing business with this person, so for the next time, I’d do the following:
– email
– if no response after a couple of days, a second email (still friendly in tone)
– if still no response, a direct phone call (not to his superior)
– assuming your relationship with this person is still positive, a follow up email to the phone call.
– if still no response, consider this a lost cause, and consider that perhaps something needs to change with your value proposition.