Registration of a company with forged signatures of few memb

What are the consequences of getting a company registration with forged signatures of few members? Given the scenario that on personal request complaint from the members whose signatures were forged the company has been issued notice for cancellation of registration by registrar of companies. The company has been in existence for past 5-6 years. What all legal actions can be taken agaist the persons involved, by the persons whose signatures were forged? The persons in question are close relatives. What legal action tha registrar of companies suppose to take in such conditions, besides only ordering cancellation of registration.? Please guide.