Who called from 3138792703

Got a call from this number. Any idea who it could be?

This number has called on a few different days never leaves a message.Adding to block list.

Called this number back today it's Diversified Consultant's.Told them to take me off of there list,said they would.Googled them this is what I found" Telecom-specific collection agency specializing in the recovery of Wireless, Landline, Cable, Satellite and Security debts."

Calls constantly to my place of business.  Never leaves a message.  Picked up once and they say they are from Diversified in Southfield about Sprint.