Got dead air.

Caller ID Unknown Name , no message left.

Scam, they say they are with Microsoft

  I got my first call from this # last week.  No message, caller-id said Wilmington, DE. No message, no namne, no answer. Blocked it after coming here and seeing the comments above.   I have been getting calls from this number daily ever since, sometimes only nminutes apart.  Most spammers give up after a day or two but these guys seem to be stubborn.  Still blocking.
 I'm surprised there aren't mnore notes.

IRS  trying to get in touch with me. Call this number immediately. Numerous other calls from same number, no message.