A company is required to give intimation of appointment to every auditor(s) so appointed within seven days of the appointment. The intimation may be given in form of a letter on the letter head of the company by a responsible officer of the company.
You should send the Intimation of appointment of auditor till 05.10.2012.
Obligation on the auditor to give intimation to the Registrar:
Every auditor appointed under section 224(1) by a company in annual general meeting shall inform the Registrar in writing that he has accepted, or refused to accept the appointment. The information shall be given in e-Form 23B within a period of thirty days from the date of appointment.
It is worth noting here that only the auditors appointed under section 224(1) are obliged to give notice of their appointment to the Registrar in e-Form No. 23B.
The auditor should file Form-23B up to 03.11.2012 without additional fee.
The MCA by general Circular 31/2012 dated 28.09.2012 given liberty to auditor to file Form-23B without additional fee up to 23.12.2012