Picked-up on 3rd ring, said "hello" politely, said it two more times with no response at there end then I hung up. Won't answer again. We get at least 6 to 10 mystery calls a day. Getting tired of it.

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Just got a call from this number.  After the third ring I interrupted the call, i.e. picked up the phone and put it down again.  I just don't answer calls from numbers I don't recognize, and if I can help it, I try to prevent them from leaving a message by interrupting the call.  If everybody did this, that would discourage scammers and robocalls.