Call blocker might be of some help. Also don't pick up on numbers you do not recognize, or where there are caller IDs that seem odd. Or where there is no caller ID.
I love the photo! BTW it's great to see someone that has some sense & knows how to use their CID. It is really sad to read all the posts from CID owners that answer calls from #s they don't know. Why did they buy a CID if they don't use it? I'll never understand, Anywho your pic made me smile.
I have used calls blacklist for awhile now and have no problems with these numbers. I downloaded the app from the play store and block everyone of these numbers after I look them up on Google. I just add them directly from my call list. I hope this helps.