I have received 2 calls from this number,918-579-9282....and they left voice messages following each call.
Is this for real, debt collector/Instacheck?  I did call the number back and heard message....

who is this?

After repeated calls, but no messages, I called the number to ask who they were calling for. After verifying the number I was calling from, they asked if I was Erica, when told I was not, the woman on the other line said my number would be removed from their database. I suggested that their calls might prove more effective if they not only allowed the phone to ring more than twice, but actually leave a message. In the most hateful tone of voice I was told to keep my bulls**t suggestions to myself. When I asked to speak to a supervisor, the woman said she was a supervisor so I could forget that, I then said I refused to believe anyone as idiotic and rude as she would be in charge of anything. For some reason, the call really went down hill after that. :)
However, she did answer the phone as Instacheck, but further investigation referenced 918-579-9282 as the "unlisted" number for the Tulsa office of Instacheck .

I received a call from this number on my cell phone. When I called it back they answered "This is instacheck". This is a bill collector.

received call on cell phone. no message. cell phone indicated call came from a cell phone

Found on cell phone.