Today I received a call on my cell from 312. Since my phone was in my coat which was in the closet I did not answer the call. They did not leave a message.
I got at least two of these calls. I just had an appliance delivered as well. But when I tried to answer there was no one there. Too bad for them because then I figured it was a scam so I added them to my phone's reject list and blocked them from my Google voice number.
Got two calls from 312 today. I have given up trying to stop them from calling. So, the first thing I do with these numbers is to add them to the "Do Not Call" group on my phone, which is assigned the silent ring tone. They don't stop calling, but I never hear it ring, so it doesn't bother me anymore.