In order to encounter the delays in legal matters such as a legal heir certificate, it's important to take some proactive steps. To initiate the process, immediately consider sending a formal written request or a legal notice to the Regional Deputy Officer (RDO) of Thirumangalam, Annanagar west, Chennai 600101, highlighting the reasons for the cancellation and the need for swift action due to the inclusion of a missing name in the heir certificate.
The citizens of India, under Article 21 of the Constitution, have the right to timely administrative actions. Therefore, this delay may also be challenged as a violation of this article. The case of Sheela Barse v. State of Maharashtra (1983) also highlighted the duty of authorities to promptly act in matters concerning fundamental rights.
Moreover, if the delay persists despite formal requests. filing a writ petition in the High Court under Article 226 of the Constitution, seeking directions to expedite the cancellation process, may also be an option which may compel the concerned authorities to take immediate action.
In addition, the Right to Information Act, 2005 also allows individuals to seek information on the status of their applications, which can also be utilized here to inquire about the delay officially.