Fake Caste Certificate by Father -Course of action needed

I earnestly solicit your advice to my following case: 1. I'm working in a state government undertaking for the last 5 years. I have secured job under scheduled caste. Recently i got to know that actually my family belong to caste which comes under Other Backward Caste but by adding a word before caste name they have obtained SC certificate. 2. Not just my family but a set of 20-25 families with same surname have been doing this for the last 2-3 generations. Most of the people belonging to my father generation have worked in govt jobs and got retired using the SC certificate. 3. I have secured good rank to secure admission to my engineering, and also secured 4 jobs in govt organisations after my engineering, of which one job was secured in Open category. I would have admitted to the same course and got the same jobs even if i was under OBC because my score was below General Category but sufficient to get under OBC category. 4. Since i was unaware that i belong to OBC, i joined job