[opless]

I hang up on them after telling them that I'm not interested in talking to them.

Reasons include "I'm onsite, so can't talk, sorry"/"I'm about to go into a meeting"/"I'm not interested in your role"/"Please remove my details from your system"/"Stop harassing me, otherwise I'm calling the police"

I've only had one particularly aggressive recruiter around 2000 wanting me to work at Yahoo. I was quite happy with being at my start up and he threatened me with not working through his agency, ever. I agreed with him I'd not want to work with his agency. Hasn't affected my workload then or now. Though I was terribly paranoid about it at the time.

90% of my work over the past 5 years has been repeat business through prior clients once they're outside the compete clauses.