If the payment of Gratuity Act 1972 is applicable to the establishment then it has pay the Gratuity.
The employer has to supply the notice of determination of Gratuity and pay Gratuity even if no application by employee is made.
IN your case thr employer shall be liable to tender interest @10%/pa for the delay………………..
You may submit FormI of course under proper acknowledgment preferably thru redg. Post, along with a letter mentioning all representations made so far by phone/in person/by email/letter etc and mention names, dates,……………………………brief minutes of discussion.
You may refer to;
Payment of Gratuity Act 1972: Sec1: 3 (b) (c) (3A) , Sec2A: 2(a) (i) (ii), Sec7, Sec8, Sec9…………
There are many threads on similar query at;
https://www.lawyersclubindia.com/forum/display.asp?cat_id=9&forum_id=49#.Uz09BUeBmXU
e.g;
https://www.lawyersclubindia.com/forum/Company-is-rejecting-gratuity-after-working-4-9-years-91201.asp#.Uz057EeBmXU
https://www.lawyersclubindia.com/forum/Clarity-between-gratuity-eligibility-service-5-or-4-8-yrs--28768.asp#.Uz09IUeBmXU
You may record (audio/visual) the reply of HR as posted by you and later draw the attention of HR and employer to word ‘WHOEVER’ IN SEC: 9, AND PROVISION OF PUNISHMENT AND PENALTY….