CID reads "None"

Spoofed CID (illegal), no voicemail left, no idea what it's about. Didn't answer, don't plan to call back. Reported the pieces of s.h.i.t. too.

CID reads "NONE"
I answered.  10 seconds later female voice "Goodbye" & hung up.
Recently read that many scammer calls begin with "dead air" call to harvest live phone numbers.
blocked whole area code.

Second call today saying my computer was infected.  I said well someone already called me and she said yes your computer is infected.  So I told her I will tell you what I told the last one who called. $#%$#%$$%%$%$%$$