I'd stop doing business with a man who threaten me (if he is the boss. If he is an employee, I'd try to see that with the boss). You can't protect you for that

I'd stop doing business with a man who threaten me (if he is the boss. If he is an employee, I'd try to see that with the boss). You can't protect you for that of it will be very expensive. You can proactively search for a good lawyer.