Sterling Tree Magnum (India) Ltd — Maturity and interim amount not paid by STM for investment made

I had invested in 11 teak tree for an amount of Rupees 20, 000. Date of joining - September 28, 1996. Maturity Date - September 27, 2016. Certificate Number - Q497. I have not got my interim payments / maturity amount. Name of Investor - Vedanta Chakrabarty and Mridula Chakrabarty