Pro-tip. The written word does not carry with it the other parts of non-verbal communication. So when you lodge a complaint lacking in details with no specifics, all we can really do to start with is tell you to calm down and explain your problem.
You came here looking for help and honestly your attitude wasn't the best as written. Yes it was you venting, but please note you were venting to the community that surrounds these people. In the words of Larry the Cable Guy you just walked into the middle of a trailer park and yelled "Walmart sucks!"
What do I mean? Every time I have placed an order with FliteTest, I.E. my wallet has opened and cash has left it, my order has shipped within 24 hours, even when the site warned me of a possible 4 day delay due to current demand on one of my items. This was among the rush that was the initial power packs. My experience has been under promise over deliver, consistently.
So yeah, I get you're frustrated, yeah some people snapped back. Mainly because you weren't just calm, well thought out, and posed the question like this, "Does anyone know of any way to contact the guys at FliteTest beyond the Support page? I've already had an initial response from them but I sent a follow up reply to clarify something regarding an order I'd like to place but haven't heard back for a couple days now. This is preventing me from placing an order which I'd really like by the weekend if possible. So if anyone could help I'd really appreciate it."
Describes the problem, is concise, and doesn't provide anything that will cause "target fixation" where people will see only part of what you wrote and miss the rest. It also conveys that the ball on this one is largely out of our court and needs to be routed thusly.
Welcome to the community, as a whole we're more than happy to help, it's just best to avoid saying things that could cause a lot of us to walk right on by.