This is the Biggest Disadvantage for professionals (CS) in employment.
We should Start Practice to file our Own DIR 12 for resignation Before the Last date of office.. Bcz This Pratice has been Start by many Corporates or unethical peoples
Now I would suggest you to generate the ISIN No on ICSI portel and Mention this point in it. If this is already Generated then Write mail to institute and MCA.
Till that time try to Contact with the CS Who is there as on date and Ask her to file it. or inform this to the auditor or Statutory auditors of the company.
For Auditor there is form ADT 3 but for the CS who files it has no right to there Resignation form.
This point has not been even reply by ICSI chapter when i have raised the query for the same