The one thing that really really stand out here is how unqualified the installers are.

I personally would never attempt, nor allow my company, to take on work that we don't know how to complete.

That may be the biggest difference between phone guys and others doing phone work.... we just have to have 99.999% uptime or something just isn't right!

Did they give you the impression that they knew this stuff?? if so i would wreak havoc and tell them you need a more qualified installer!