The first thing I recommend is that you send the CRA a "Block of Information Resulting from Identity Theft" letter under the provisions of FCRA 605B. That will require the CRA to block any further reporting of the information in your CR.
All you need to send to the CRA to commence this block is:
1. Appropriate proof of your identity;
2. A copy of an identity theft report.
This is nothing more than a copy of the police report, as defined in FCRA 603(q).
3. A statement that the information is not information relating to any transaction by you.
The CRA msut then send the furnisher of the information a letter informing them of the block, and its effective date.
You can, and should, continue to dispute the failure of the credtior to entirely delete the information from your credit file. In your prior communication with the creditor, did you clearly identify you correspondence as a direct dispute under FCRA 623(a)(

, or was it just a letter of request?