If issues over the legitimacy of the debt have been resolved, and you are in the process of paying the creditor, I am unsure what would be the basis for disputing their reporting.  What is inaccurate?

Paying is apparently under some agreement reached with the creditor.  The legal obligation to continue those payments is entirely separate from any issues over their credit reporting, so I dont see a one-or-the-other issue.

What is the basis to "fight the creditor to have it removed from my credit report"?