When Vendors don't answer calls, emails, voicemails?

So i would pose a question to you. I have no idea who you are, or what shop you own, but if a customer asked for your business motto, and how you feel about your customer service, and how you are to deal with as a business, and a person, is the above, the speech you'd give?
That what you want the world to see as your thoughts on customer service?

To answer your question honestly, we (my co - that I built out of my garage) have one of, if not the best customer service ratings & reps in the entire industry. I spend exactly $0.00 on advertising and have never once paid for or supplied product for a review, an eval or to be pushed, plugged or promo'd via social media.
How can that be? because of our customer service, global product reputation and business model. Nuff said.
You may think my views and opinions are soley my own, but I'm telling they are not - among business owners big & small.
Proof of that is EXACTLY why your frustrated now (with said co) and had no other way to deal with it, then to take to social media to vent, like all the kiddies do.
Talk to ANY customer service agent from ANY business and actually listen to what they deal with not on a daily basis, but on an hourly one. It will blow your mind the crap people say, try, do, threaten and rant about!
So - You may well be the victim of the countless jerk-offs before you, that ruined that business owners desire to communicate with his/her 'potential' customer base..but sadly, I kinda doubt it.
I guess what you failed to understand in my previous post, peeking under the curtain, into the other side of the customer service window is:
If you as a "customer" (particularly one who hasnt bought a single thing yet) pester &/or demand anything from an already busy, overloaded, regulated to death business, that may well be doing all it can in a 24hr day, with what most likely is BS 2000 questions or demands for this & that (including demanding replies when & how you'd expect it), repeatedly, then no, as a matter of fact, they will decide they really dont need, nor want your business.
You said yourself, "repeated calls & emails" This may again sound harsh ( again -not intended to), but I spotted you a mile away and dont know a thing about you - from 1 post.
How would you like to be pestered relentlessly? exactly.

I assure you, the owner of whatever Co your trying to reach, spam foldered every one of your emails and will never call you back....
Hear it or dont, believe me or not, You became "that customer" before you could even become a paying one.
Its a lesson in how people behave when they want something, but more importantly, its a sign of how they are, or are going to be - when they dont get it.
best of luck in your endevors. Im out.