Keep it short and evidence-led: “Loan account [last four digits] was fully repaid/foreclosed on [date]. The attached final payment proof and current ledger show [state]. Please confirm account closure and issue the NOC/no-dues or closure letter. If closure is blocked, identify the exact outstanding amount or document and provide the calculation.”
Attach the final payment proof and ledger. Avoid sending identity documents through insecure channels when the lender already has an authenticated complaint route.