Reliance Polypropylene Limited — not received any returns from company

Address:

Nariman Point, Mumbai City, Maharashtra

Sir, i am holder of reliance polypropylene limited debenture certificate issued in 1993. My master polio no. Is 73747554 and certificate no. Is 00161865. I have not received any returns from company till date. I have heard that the company has been migrated and the new company has issued bonus shares. The company has not conveyed any messages nor has taken follow up. So please let me know how to claim my hard earned investment.