Have received many calls from 305-508-5486. What people don't seem to understand is that you can't block or report these telemarketers. They are using spoofed numbers and they originate their activities from overseas, which puts them outside the feeble efforts of the FCC to regulate this activity.
Don't even bother to answer anyone unknown.. If they don't leave a message, its unimportant anyway. Keep your peace of mind and put them on "ignore" list on cell phone, or "blocked list" on landline..