Dear Mr. Bhupeder,
You please go through the provision of the section 305 (5). This section does not provide the procedure to substitute the authorised representative in a complaint case.
This section provide the procedure if an company is an accused in a case then what procedure has to be adopted.
Now come up to the main query. Mr. Mugundhan, you need to move an application under section 302 (2) of the Code of Criminal Procedure Code, 1973, along with Board resolution or power attorney of new Authorised representative. The court will surely substitute new AR in your case.
You can check out the link below where i hv answered the same query.
https://www.lawyersclubindia.com/forum/Re-Death-of-a-Complainant-in-the-matter-of-138-of-N-I-Act--23417.asp
Thanks