If the dispute was resolved, meaning you received a Notice of Results of Reinvestigation from the CRA, they need to preserve the dispute as being possibly relevant to duture reporting of a reinsertion or to determine if a subsequent dispute is a renewed dispute that is substantially the same as a piror dispute.
Thus, it it unlikely that a CRA will delete its records of a prior, concluded dispute.
However, if your issue is one of merely updating to show that a prior dispute was concluded, the CRA can and should update without a problem.
