Who called from 8170247862

Unknown caller and they don't leave voicemail.  Another Robo-dialer.

Don't know any phone number starting with zero. Didn't answer and they didn't leave a voicemail. I blocked it.

Another SCAM. No msg left. Tried to call back but no such number.

Don't answer unknown numbers. No message left so this number will get blocked.

Caller ID reads "Unavailable".  I picked up the line and gave our business greeting.  The "person" begins to talk "This is Alex with American Guard"... I didn't say anything, then "he" said "hello are you there?".... then the call dropped.  Seemed like a robo call.