I properly filed a dispute of XXXX unknown medical accounts with Equifax on XXXX/XXXX/2015, they responded with a request that I contact the reporting collection agency, which I did on XXXX/XXXX/2015 ( proof of delivery attached ). The reporting collection agency did not provide me with any valid answer. I re-disputed to Equifax on XXXX/XXXX/2015 with a copy of my letter to the collection agency and proof of their receipt, Equifax again refused to properly investigate or delete these XXXX unknown medical accounts. Equifax opened the investigation XXXX XXXX, 2015 and mailed me the results of the investigation by XXXX XXXX, 2015. Equifax is the only credit reporting agency reporting these XXXX unknown medical accounts. I also contacted the reporting collection agency on XXXX/XXXX/2015 via phone ( since they were not responding to my requests ) I was told that they do not hold these XXXX unknown medical accounts.