Essar Oil Limited — Refund of amount

Address:

Essar Oil Limited, Regd Office:Essar House, 14 Haddows Road, Nungambakkam , Chennai - 600006

I have 100 partly paid debentures PArt C of Essar Oil Limited vide certificates no 185953 and distinctive nos from 42311701 to 42311800. i have not received any amount till date on this debentures. could you please advise me in refund of these company debentures,