There were two weeks worth of 815-550-xxxx calls. But  no one responds on the few I answered.  Now I have been getting calls from numerous 847-352-xxxx numbers but no one every responds after I answer.  They are calling a business cell #.  I have already submitted a complaint to the FTC and re-listed this number on the National Do Not Call Registry. I immediately called back and no one answered; no voice mail either. Here's the list of numbers:
847-352-9475
847-352-6852
847-352-0156
847-352-6420
847-352-9012
And today a new one:  847-526-9742.  Before the 847-352-xxxx numbers