I had difficulty verifying my identity over the phone. I don't have the information abo...

I had difficulty verifying my identity over the phone. I don't have the information about previous accounts I was being asked about because I have not used store cards or applied for one in some time. I just need to find out what two charges are on my credit report acquired through the Neighborhood Assistance Corporation of America (NACA) program. The two reports only say MEDICAL and I cannot locate who would have reported them to a credit agency. Both were reported to collections on *********. I have never had so much difficulty verifying my identity with any other credit institution and this was an incredibly infuriating experience. Please tell me EXACTLY what is needed to gain more information about how I can resolve these reports on my credit report.