TransUnion Credit Reporting Complaint

TransUnion Credit reporting department,

Credit reporting company's investigation No notice of investigation status/result Illinois

I have made several requests for Trans Union to verify with whom they received information regarding an item posted in my credit file which I have informed them is not mine. I forwarded a copy of the letter to the creditor to verify the debt as mine and they could not. But, I want to know with whom the credit bureau spoke with to allow them to keep " verify, no change '' report in my credit file. The debt is not mine nor could the creditor properly verify the debt as mine.