First, let me clarify, did Susan say there is a "Red Flag" or is that your interjection? You make it sound like she said it. If she did, and they are a legit company, she could be guilty of slander.
This document list them as being in Winlaw which is also what bfcorestsafe states.
You said "Bermal Contracting Ltd is an Independent Owner Company"
Now let's say I have a small business and I run it at my home in Jeffsville. This is where I incorporated. However, I have a composting facility about an hours drive away where I do all the stinky composting in order to keep it away from any city limits. It is near Stinkville. Would I join the chamber of commerce for Stinkville or Jeffsville (if I joined any)? The answer is Jeffsville of course; I do my busines there, I am incorporated there, I pay my taxes there. Now why would Stinkville's chamber of commerce have any knowledge of my property nearby? I do not do any business there and may even be outside the town's limits since I am located NEAR, not IN. BTW, not everyone joins the chamber of commerce. In fact, I doubt there would be much benefit since they do not operate a retail facility. Also, how much benefit woudl you get from joing a chamber of commerce in a town of 1000 people?