Forceful resignation and denial of experience letter by top mnc

I spent lot of money during my transfer process and thought of claiming everything I have spent because of my transfer. But since I cannot claim the expenses incurred by my husband who was there with me during my transfer process, I thought of including all such expenses as rent by taking receipt from my PG owner and the PG caretaker agreed to it without any hesitation. He gave me the valid receipt for the same. On a personal level, I didn’t feel like doing anything wrong as the money was spent for transfer purpose and the company would have anyway bear such expenses if the company themselves would have arranged for my accommodation. However, when I disclosed this claim to my husband, I realized that my claim can become a serious issue and So, I immediately cancelled my claim. After a week of claim cancellation, I receive a mail for admin asking me to meet HR for clarification. And for this cancelled claim, an action was initiated against me.they called me up for discussion and they forcefully made me submit my resignation by mentally harassed by repeatedly asking the same set of questions again and again. i was dictated my resignation letter by Hr. Their action was initiated against a cancelled claim which totally defeats the whole purpose of cancellation. They didn’t pay heed to my explanation or justification and they even didn’t allow me to serve my notice period. My notice period would have ended in November end after which i was supposed to get my post graduation degree from bits pilani. after my termination,they denied my degree experience ltr for which i had worked hardly and performed excellently for last 4 years. I made many request for giving me my experience certificate and allow me to complete my degree which i would have completed in next 2 months but all my requests were unheared. I requested almost my top heads of companies. I was assured that they would do investigation but after a week they came back to me just to know incase i had any proofs of claim cancellation. when i said i dint have any. then after 3-4 days they again came back saying that their action was justified. then after repeated mails they gave me one month sal and closed my settelement and issued me a testimonial certificate saying i was not an employee but a student.on this basis they denied me the experience certificate as well. these four years even though acc to them when i was enrolled as an student, i worked like a normal employee abiding to all rules of normal employees (but benefits of only students were given). i was assigned projects, interacted with clients, company got billing on my name from client. they presented us (me and many like me whos pursuing this education program from company) as project engineer to the clients.i filed case i labour court and need advice and a lawyer for the same. please advice