Who called from 8283335882

This number has called me three times in the last week.  Did not leave message.

Several calls in the past couple of weeks. No message left. Caller  ID shows: IMC

Calls, leaves no message

International Medical Corps (IMC)  Address: 12400 Wilshire Blvd #1500, Los Angeles, CA 90025 called today. They use local numbers (I'm in the (828) area to fool the gullible public. They say they are a non-profit organization (?) soliciting donations for foreign (read Syria) countries that have a need for medical care during conflicts. I hung up.

Why can't these people be stopped. I have filed complaints with my phone carrier and well as local law enforcement.
Really getting tired of this