This number keeps calling our work number. When I pick up, no one is there. When I Google the number, it shows up belonging to Denistry by Design and a Dr. Richard Coffman. However, Dr. Coffman's real number is totally different. I talked with his staff and they had no idea what was going on.  When I called (317) 644-2444, I discovered it belongs to a debt collection company, Phillips and Cohen.  They're known for their questionable "antics" (such as hiding behind a reputable dental business) and have a long history of complaints. I'm not sure why they are calling a business since they never say anything. Any suggestions on how to make them go away?