Bindal Agro Chem Ltd — Convertible debentures 50

I have applied for 50 convertible debentures of 200 each in 1989.
I received 50 shares as a result of Rs 100 converted.
Nothing received for the balance Rs100.
Not even a single letter from the company in 32 years.

Please advise the current position.
50 Shares in Shares in physical form.