Enough about the problem. Now for the solution. :-)
I do not have the context or I could've helped you more. I looked up your profile and you seem like a really intelligent and talented person and it says you are an AGM, but still given today's ambiguous job titles, I wouldn't know what you do exactly, so I am going to hazard a guess.
If this is a sales situation you are talking about, here's your best bet in dealing with it.
If the person seemed to you during your rendezvous with them as a genuine buyer who actually had a need for your product or service, back up for a few weeks and get in touch with them again. You see, today, people are busy. Very busy. You have to keep reminding them. It's okay if someone goes radio silent on you. It's okay to call back again after some time. You are not stalking them. You're just trying to help fulfill their business need.
If, however, you go over the first meeting you had with this person, in your mind and you come to the conclusion that this person did not have any real need for your product, and simply called you to waste your time, and is actually a moron, as in, they have no personal sense of responsibility, did not keep up their appointment, made you run around, don't respond even to your emails, then here's the real solution --
Move on! there's plenty of fish in the pond!
A moron like that is not worth your attention. If they ill treated you because of their personal habits, chances are, they will do it again. You can't change people. Habits are the most difficult things to change. Just move on. Go knock the next door.
Here, an article of mine highlights the agony I've had as a salesperson:
The Enterprise of Survival Is a Numbers Game
Here's another one:
Success Is Formulaic
Here are some tips for your next business meeting :-)
10 Tips For Success At Business Meetings
Here a really motiational video from Jim Rohn on this topic called The Law of Averages:
Jim Rohn - The Law of Averages in Sales and Management - YouTube