Polyplex Corporation Ltd - Non Payment of Gratuity other amount

Company: Bhilangana Hydro Power Limited
Address: B – **, IIIrd Floor, Sector *, NOIDA – ******, Gautambudh Nagar, U.P.
Phone (HO) **** *******
Details of Employment:
Joining Date: ** June ****
Joining Location: Village: Ghuttu, Distt: Tehri Gharwal, UK as Manager (M-III)
Transfer to Noida (w.e.f): ** August **** (Via Office Order)
Resignation Submitted: ** October **** (** Month Notice Period)
Company Issued Acceptance: ** December ****
Relieving Date w.e.f: ** January ****
(Relieving letter was provided to me in March ****)

In October ****, the Company in very coercions’ manner informed me that my association with the company has been changed into a contractual basis with immediate effects and my fixed salary and other positioning benefits has been ceased.
As the terms were not acceptable to me, I Therefore submitted my resignation to the HR. Initially, the HR manager did not accept my resignation but I in very clear terms stated to them that I will stop coming to office from due relieving date (i.e. ** Jan ****).
Despite this, the company exploits me for another *-* months (i.e. Jan, Feb, March ****) and I was forced to work in the company on a contractual basis till March ****.
The company threatens me to continue my service or all my dues will be fortified. hence with little respect and fear I was forced to work till ** March **** with no pay.
On my repetitive request the HR Manager on **th March ****, relieved me and provided the relieving letter and experience certificate which was backdated **th January ****, on the pretext that I have to sign and accept their terms of final settlement (**% amount) and forced me to sign a blank paper.
The company till date (ie **rd July ****) has not paid any amount due towards my
Last Salary : Rs ******/-
Gratuity : Rs ******/-
Last TA Bills Rs *****/-
and Other Leave Benefits
Total Amount: Rs *,**,***/-.
Now, when I call the HR manager he states that all my dues have been paid as I have signed the final settlement statement but no receipt of the amount was ever signed by me nor any bank transfer stat
Through, this Complaint would request you to kindly take this matter on priority and guide the path further so that my dues are cleared at the earliest and the stingiest action against the Company can be appropriated.