Toubro Holdings Ltd — Redemption of redeemable preference shares

I have purchase redeemable prefernce share of Toubro Holdings Limitd on 18.06.2005. The details of holding are as below

No of Shares-500, RS 10 Each
Certificate No-025996
REGD FOLIO NO-PA025996
Name of the Holder-JOGESH CHANDRA DEY (Died On: 22.11.2018)
Nominee: JAYANTA DEY
REDEMPTION DATE: 10/05/2021
REDEMPTION VALUE: 50000

I could not redeem the shares due to lack of information. Please help me about the redemtion procedure as wel as how to claim the refund amount in this regard