I've gotten a lot of calls from this number lately.There's a list of them on my xfinity phone log for missed calls.  "IMC" is what shows up in the caller field.

this number calls my house EVERY day, going on 3-4 months now.  I have it call blocked with two different systems and I still see t on my caller id.  It shows up as IMC.  I called the number back from a work line and it says Thank you for calling the National Rifle association, Something about recent changes and updates and press 1 for more info.  No way to stop the calls however.  I am not a member of the NRA.  I have nothing to do with them.  This is obnoxious!  How do you get it to stop!!!!

Caller ID shows 'IMC'. No message left.

They're at it again. Been calling every day. Going to block this number.
I don't answer any calls and they don't leave a voicemail.