Who called from 3016666697

This person left a message that I should go kill myself... they better not let me find out who they are

Calls keep frequently coming from this line over the past 3 days.  No message, just calls.

5 calls in the last 2 days, with 3 of them occurring today. No messages left and I have texted them to leave me alone, with no landline response. Definitely a cell phone