Since I work with many in Illinois, I thought I should pick up the call (normally, if no caller ID provided, I do NOT pick up call). There was no response from the caller, so I just hung up. Very annoying jerks!!!
I got called three times (never picked up phone). On the fourth call, I picked up and waited about 30 seconds to get someone..At which case I went nuts and asked to be put on the "do not call list". They promised they would and after 24 hours, no calls.