Neighborhood Block Not Working

I have been receiving a lot of spam calls, every day, all from one area code.  Since My Services only allows you to block a few numbers (5, if I remember correctly), I had to use the Verizon app to "Neighborhood Block" and entire area code. Now I just keep getting voicemails from "Blocked - Neighborhood." So it's not really blocking them! If they're able to keep calling and leaving voicemails they're not blocked. Multiple times a day I'm getting spam call from multiple numbers in that area code (which is not where I live so it's definitely spam). Help!