Notice period applies only to employees who had functional responsibilities and authorities of a manager and it is not a blanket application through out the employees. Moreover, no employer can forfeit or refuse gratuity on the ground of non serving of notice period. Gratuity can be forfeited for reasons as provided under section 4(6) of the Payment of Gratuity Act. That section is applicable when an employee is dismissed from service for a misconduct involving moral turpitude or misconduct of causing loss to the company by the gross neglect or destruction of company properties by violent behaviour. Nothing of these will apply to you and, therefore, as suggested by KK, you may send an official complaint to the Controlling Authority in form N. If your establishment has branches outside one state, then the Controlling authority will be the Asst. Labour Commissioner (Central) and if your operations are confined only to one state, then the authority to decide such cases the officer of the State Labour department is the appropriate authority. The attached is a draft of form N.