call from NY.... have no idea who is calling.  no message left.  reporting and blocking number

Back brace Scam. Robo voice saying I asked them to call after seeing an advert. Nope. Repeats every month or so. Block and then another 646 shows up.

5th scam call from these people:
646-517-7574 called Sept 20, 2016 at 4:42 pm.  Caller ID = UNASSIGNED.  No message.  Thank you 800notes, it's the phoney back bace people again.
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PRIOR CALLS:
Block these Back Brace scam numbers - 646-432-4777, 646-257-3620, 518-375-3376, 646-759-8953, 646-517-7574
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646-759-8953 called July 27, 2016 at 12:19 pm.  No message.  Caller ID = OUT OF AREA.  Thank you 800notes, I don't want to be scammed over a free back brace.
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646-432-4777 called June 10, 2016 at 12:16 pm.   Caller ID = OUT OF AREA.  No message. Thank you 800notes, this is the old Back Brace scam. Criminals. BLOCKED.
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646-257-3620 tried to spam me on Mar 29, 2016 at 11:28 am.  Caller ID = OUT OF AREA.  No message.  Thanks 800notes, blocking spam call about back braces.
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518-375-3376 called Nov 16, 2015 at 9:48 am.  Caller ID = OUT OF AREA.
Thanks 800notes.  I know this is a scam about a medical back brace for sale targeting senior citizens.

Caller with foreign accent knew my name and that I use medicare. I hung up right there because it is going to be either the medical alert system or back brace scam.

If you are dumb enough to answer you deserve the call. Why do people answer/  if no one answered the calls would stop.