Some listed companies are not paying shareholders the dividend which is declared

In a fraud which the mainstream media does not cover some listed indian companies are not paying the shareholders the dividend which is declared.
They are claiming that the dividend was sent to the shareholder by post, yet the dividend is not received
Most of the shareholders who do not receive the dividend are usually eligible for only a small amount.
When questioned, the company secretary will ask for bank details, yet the dividend payout is not processed, even after 15 days
Shareholders who have not received the dividend declared can contact at