Don't even bother giving them the time of day, just cut off the conversation and save yourself the trouble, if these people are real they'll use far more polite methods of contacting you, I firmly believe that landlines are primarily used by scammers now.
I didn't give him the time of day but when someone calls and asks for a person I have to answer. They have information. My address. My home number. I don't know how they got that. My stepdads name.
Nearly before ending the call I said "You have 10 seconds to explain yourself, to give proof" He started saying my address and I cut him off saying That's no proof.
It's a little exciting talking shit to an asshole scammer on the phone. Time has already been wasted anyway.
Don't take it too personal, that's my advice.
If you feel like you can't help it then install an App that records all phone calls, record this call and upload it to YouTube, share it with your friends on Facebook and other social networks and tell the guy he "has just shot himself in the leg" for tying to scam you and now he's exposed.
I don't think they care about being exposed. Searching the number online there are reports of scams originating from the number.
I suspect it's a call center making some money on the side by doing scams, or perhaps one dedicated to scams.