You should follow the following procedures for filing Form-32:
1. First appoint new directors of the company. In the same resolution you mentioned any director of the company authorise to sign and file the same with ROC, then you resigned the existing directors. 2. Then You file the Form-32 of the newly appointed directors by using digital signature of any director out of earlier three directors which will be resigned. 3. After Filing Form-32 of new directors, check portal of MCA showing the new name of directors. 4. Again file Form-32 with ROC for resignation of old directors with using the digital signature of new directors.