I have never redeemed dividends and the bank said I did not have any amounts to receive, why is that?

In general terms, in accordance with Law 6,404/1976 (Brazilian Corporation Law), any action claiming dividends prescribes three (3) years after the date on which they were made available to shareholders. Therefore, the right to receive dividends from corporations is subject to prescription.

However, if the share in question has specific rules regarding the payment of IOE/dividends, shareholders should directly contact the custodian for additional information.