It's the Illinois Department of Revenue. It's an automated call. I just received 10 calls in 4 hours, most one right after another, from all these numbers (some more than once):
I picked up on the 6638 number when it just called and it was an automated message telling me to call the department of revenue and a number to call. I'm hoping the automated calls will stop now that I've answered.
received a call from the 6642 number. No message, missed the call. I haven't been to Illinois since I was about 10, dont know why they would be calling????
Just called the Illinois Dept of Revenue. They did in fact have my phone number; however; the name did not match (they had my number with someone elses name). They have advised that I may receive a couple more residual calls, but after a week or two the calls will stop.