I don't use guys who do "cold calls."
if I tell you to call me when I am in the area, or if a trusted friend refers you, then maybe.
I even got burned by a guy referred by a friend once.
It wound up being funny...I finally got so mad at the guy that I told the Lord if He didn't shut him down, I was going to do it myself. Thirty seconds later, the guy made a dramatic hand gesture and busted his finger open on the corner of the podium. It turns out he was the wek stomached type who couldn't stand the sight of his own blood.
He turned pale and turned the service back to me.