Investors of Sovereign Gold Bonds (SGB) or RBI bonds at Punjab National Bank must visit their branch to verify bank account details on a priority basis.This notice specifically targets individuals whose interest payments are overdue, or whose bonds have matured or are maturing soon.Customers are advised not to close their linked bank accounts until redemption to avoid delays, and if a closure is urgent, they must provide alternative account details.For interest or principal unclaimed for more than six years, investors must adhere to specific RBI guidelines outlined on the bank's website.