I served Air India 9 years and then resigned in 2016.At the time of resignation, i was not aware the service policy. After 4 years, suddenly i came to know that i committed a mistake. I should have asked Voluntarily retirement instead of resignation to get benefits of free flight tickets for whole life as per entitlement based on designation.Because the Air India policy says that if someone served in another govt organisation before joining of Air India, his service length will be counted. So i served in Indian Air Force 10 years. So it will be added to 9 years of Air India. It becomes 19 years.And the employee is eligible for voluntary retirement with ticket benefit if is more than 15 years.So i am eligible. When i contacted their HR department, they said resign case is not eligible for benefit. I apologise them but they said it is too late as all process have been already completed before 4 years, Nothing can be done. what should i do now? Because merely writing resignation in ignorance should not be enough to cease benefits as i qualify for the years serviced the company.