3 Calls, no message.

I have been receiving calls from this number for days, up to six times a day.  Sick of it!  Asked them not to call several times, but they will not stop.  Now I let it ring, they never leave a message.

3 calls today, already - caller id shows the number, i don't recognize it - ignore ignore ignore

Calling every day up to 4+ times each. They leave no message. Haven't picked up. Those who have, please post info on what they are/pretend to be/want.

Update: Thought I'd pick up. Caller asked for me by name. Terrible VoIP connection, so he was garbled, but I picked up "public opinion survey" and possibly his name, "Daniel." Asked him to place me on his do not call list. He asked me if I was sure, I said yes, he confirmed. Very laid back and polite. Sounds like it could be a legit research firm. We'll see if they actually stop calling.