There's no way to stop the calls from being initiated. Invest in a call blocker and DO NOT pick up on call numbers you do not recognize. Callers are most likely overseas and change numbers a lot.
I've gotten several calls from 201 002 0100 and no one replies when I say "hello"......... tried calling the number back and it's not a number, a recording shares it's not a valid number...........
I put this number on the auto reject list that comes with my phone. Whenever I answered it, no one said anything. Tired of wasting my time answering calls from this number.