Based on this information, I called the 888-694-5623 and asked them to remove me from their list. The Cust Service Rep knew about the Iowa number too and said he's heard of this happenning, where they call but never say anything, day after day.
Glad I found this site! Hopefully, these annoying calls will end.
received a call from this number on my cell phone. No response to my repeated "hello" Hung up and called it back, and got a phone company recording that the number is "out of order or no longer in service!"