continues to call repeatedly after they have been told not to

I don't know who's calling me using this number..

Just rings a couple of times each week, I haven't answered it because the number is not familiar to me, hopefully they will get the message that no one is answering and stop, but I don't think they are that clever.

I don't pick it up b/c it says unknown name but they keep calling.

all of you who say you are the do not call list...DO NOT BELIEVE IT there is no NO CALL LIST. My entire career i have worked for market research firms and your CITY or Municipality is responsible for giving out all of your numbers they sell them to firms like the ones i have worked for. there is no law enforcement needed because you have a public phone number and just because youthink nobody can call you please dont kid yourselves. who here believes in the NO CALL LIST?

scam or not?

Answered and they hung up. Called back and had a unavailable service message which was very faint and distant.