The scenario is that I started my career with a company ABC and worked for 4 years. Then the founders of the same company decided to create a new company XYZ and shifted me to that company without taking any resignation or providing an offer letter from the new company. The only thing that changed is that I was receiving my salary from the new company's account. Now, after a year, they decided to merge both companies, and I am now receiving a salary from the original company. When I asked for gratuity, they said that since there was an organizational change, I am not eligible for gratuity. What can I do in this scenario? Are there any cases like this where I can get a reference to show to my company?