Resignation of Auditor

Brahma nanda Agrawal (KOLKATA) (331 Points)

01 July 2018  
In My company Auditor resign by giving us a notice that he is resigning our office due to his pre occupation. And ADT 3 has been filed by auditor.

Please help me what my next step be, Whether i simply file ADT - 1 or need to follow any procedure