Gratuity

Dear Councels I am working in a private limited company for the past 8 years. Planning to quit. There is nothing mentioned in appointment order or review appraisal letter about gratuity. It just mentions my CTC amount. Pay slip also does not mention about gratuity. Heared from my senior staffs and HR that my company does not provide gratuity. Its an ITES BPO employing over 1000 staffs. Please advise my options if in case gratuity is denied. Thanks Dave