Collection agency is reporting the incorrect date of first delinquency. I have disputed with TransUnion multiple times ( XXXX times in total ) and each time, the dispute has been verified. The original tradeline with XXXX Bank became delinquent XXXX XXXX as recorded on my credit report. The debt was sold to a collection agency, XXXX XXXX, who then reported the date of first delinquency as XXXX XXXX. Due to the age, the original tradeline has been removed from my report and is no longer listed. With the suggestion of a Transunion representative, I provided a copy of a previous credit report ( XXXX XXXX, prior to the removal of the original tradeline ) circling the date of first delinquincy and estimated removal date. I then circled the estimated removal date under the collection agency as proof the date is incorrect. The dispute was verified as correct. I was told by a representative Transunion does not investigate the dispute and all documentation is forwarded to the collection agency for verification. The collection agency has refused to correct the issue. Transunion representatives have stated numerous times there is nothing they are responsible to do and the credit report is not sufficient proof of the dispute. I was also told to file a police report or get an attorney as Transunion is not responsible for investigating disputes and if the collection agency verifies the information as correct, there are no laws they have broken. Although the customer service representative was a XXXX supervisor and could blatantly see the error and agreed with me of the error, she said there is nothing she could personally do to correct the issue and all corrections must be made by the collection agency.