Many calls from this a-hole. I am on some kind of survey call list. I picked up phone, he said "hello" and hung up. My guess is he gets paid by the call, not the length of the call.
Don't waste your time on them-they will not take you off anything. Consider getting a call blocking device (or app for your cell phone)-they're available online and start around $45. http://800notes.com/nb/search?q=call+blockers