To stake your claim for gratuity submit FormI to o/o your appointing authority under proper acknowledgment.
First you may request your company {in writing under proper acknowledgment} to supply to it, and if they decline to supply put it on record. If they have already declined it you may still write to them narrating the days and dates on which you made a request in person.
This shall help you to condone the delay if any need arises for it.
You may also check with o/o Controlling Authority of Gratuity {which may be DLC at your location} if FormI is same as attached or obtain it from them and submit it to company under proper acknowledgment.
In case company refuses to accept FormI or throws tantrums you may send by redg. post and submit a copy of the same to Controlling Authority of Gratuity { under proper acknowledgment} with a copy of redg. post receipt.
If the need be you may avail the services of a competent and experienced labor consultant/service lawyer at your location.