I know how you feel. I get mad when these "people" use my minutes. Do you have a call blocking app? You might want to download one. The free ones aren't too bad but have advertisements with them. I paid $1.99 for one that let's me block entire area codes or restrict calls to those in my call list. Check 'em out.
Received a call on my cell phone 1:15 p.m. from (323) 316-1002 8-8-16 - I did not answer nor did I recognize the phone number. Very few people know my cell number and I have it registered with do not call