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615yc00000 is likely a medical collection.
CRAs are required to investigate free of charge.
http://caselaw.lp.findlaw.com/scripts/ts_search.pl?title=15&sec=1681i
They're playing with a gap in the law when they squirrel with people over the phone. You can fax in disputes, and I've been having good luck with it. You can also dispute in writing. With EQ, you can even dispute online and you don't need a copy of an EQ report.
https://www.ai.equifax.com/CreditInvestigation/jsp/email.jsp
If you want phone numbers for EQ, go here.
http://ficoforums.myfico.com/fico/board/message?board.id=generalcredit&thread.id=5445