Got a Phone call on my Cell, No Message not sure what type of call this is. I usually think its a scammer or Telemarketer but that is not always the case. Caller ID says Rome, NY

Rec'd call.  No message.  Caller ID:  Rome, NY  Will block

I didn't answer and they left no message.
Caller ID said :Rome NY   I will assume spam and block.

Nothing but dead air when i answered and said "hello" a couple more times- waste of efffing time- wish i could block certain numbers but our phone system is complicated and i cant do it on my own
(you need to get IT involved)

Recorded message told me this call was very important and I was supposed to not hang up the phone but I hung up anyway, these jokers have been on the daily rotation for a couple of weeks