If I have worked at a company for 7 years, and the organization transitions from a partnership firm to a private limited company after 3.5 years while retaining the same management, but the company denied me gratuity, what should I do? I was working in a private limited company for only 3.5 years, but when the company transitioned from a partnership to a private limited, I didn't receive any letter regarding this, and my employee ID also did not change.