This appears to be a questionable collection service named Diversified Consultants operating out of Levittown PA.  Unfortunately, the party with our phone number prior to our getting same was a deadbeat, so we still get the calls.  Since we have had this same number for just under 12 years, I guess these collection agents can't rush into updating their call list.  Anyway, thus far in the past week (only) the calls are coming from the following (215)-372-xxxx numbers: 372-1655, 372-1685, 372-1688, 372-1691, 372-1767, 372-1772.  We now wonder what number they will use next.