From your narration, your position as a Project Engineer is of supervisory nature and I presume your monthly salary would be certainly more than Rs.10000-00.
If it is correct, you escape the ambit of the definition of the term " workman " u/s 2(s) of the Industrial Disputes Act,1947. As such you can not seek any remedy under the Act for your employment grievances.
If your monthly salary is only Rs.24000-00 or less, you can institute recovery proceedings for all your pending dues like unpaid salary, leave salary etc., u/s 15(1) of the Payment of Wages Act,1936.
It is also discernible from your post that you are at present in your notice period as per the unilateral termination of the contract of employment at the instance of your employer. One can not give you appropriate answers to your queries relating to the reasonableness of the reasons cited by the employer or the manner adopted to send you out without reading the entire contract of employment.
Therefore, if you feel aggrieved and agitated, patiently wait till you are formally relieved and then file a Civil Suit against your employer for damages on account of breach of the contract of employment as well as recovery of the amounts due with interest.
My practical suggestion to you would be getting the dues by persuasion rather than time consuming legal action.
3rd July 2018 From India, Salem