Voice mail and/or a phone answering machine are my first lines of deference. Friends and family know how to get in touch ASAP if it's an emergency.
I find that the vast majority of robocallers are actually robodialers, with an actual human being on the other end. My solution is to get incredibly verbally abusive to them. I'm entirely calm but I use language that would peel the paint on a battleship and get truckers to cry. The amusing part is when they stammer and get defensive that I'm treating them this way and I get to remind them, "hey, you called me, remember?"
Am I missing something here?
The owner in a construction setting typically doesn't manage the day-to-day details, they leave that up to the Contractor. The Contractor (as in Capital-C) both maintains its own employees that are on-salary in some fashion for the duration of the job, and brings in Subcontractors as contractors (lowercase-c) for a limited duration for a specific aspect of the project with specific scope that isn't open-ended. The Subcontractor may employ salaried employees or may themselves use contractors (lowercase-c) depending on their business model.
Generally the defining points are in degrees of oversight and duration of employment. Those indiviuals engaged as contractors (lowercase-c) usually are overseen in big-picture ways and have shorter duration jobs. Those that are on-staff are probably managed more and their jobs are open-ended, there's no scope built-in to their retention that defines the completion of their business arrangement.
With your bare hands?!?