Delta Outsource Group, Inc. Debt Collection Complaint

Delta Outsource Group, Inc. Debt collection department,

Cont'd attempts collect debt not owed Debt is not mine Minnesota

I keep receiving continued calls ( many times per week ) from the following number ( - ) for a debt owed by my adult son who does not live with us. I have told at least - different people to stop calling and they promise that they have put our number on a do not call list, but they continue to call.