Diversified Consultants Ding credit reports without verifying debt Jacksonville Florida

This company without contacting me placed a ding on my TransUnion credit report.  In trying to talk to them with my credit restoration helper, they wanted my SSN.  When I gave it they said they had no information concerning it.  After giving my phone number they seemed to find the info on me. 

It appears to be an indentify theft charge with Comcast,  When I asked for detail on the charge, they refused to give me any information.  All they said was the charge was in St. Louis for Comcast services.  Comcast does not service St. Louis.  To correct this will cost me lots of time and money. 

The is really shady that they would ding my report, not cotact me, and when I contacted them would not give me enough information to thoroughly diprove the charge.