IDBI Bank — fate of my infrastructure (tax savings) bond 2004c

Sir,

This is in continuation of my last complain on 17th january, 2019 & mail to [protected]@isilindia.com on 7th & 11th january, 2019 without any fruitful response.

I purchased two idbi infrastructure (Tax saving) bonds (2004c) on 28/05/2004 for rs. 5000/- each. By this time i totally forgot the matter, and found the original bond paper is still lying with me. After checking of my records it seems to me that i have not yet received the maturity proceeds of the above bonds.
Please let me know the fate of the bonds and advise me the next steps to be done.
Detail particulars are given below :
Isin no. Ine008a09a04
Distinctive nos. [protected] - [protected]
Certificate no. 631625
Holder : bimalendu pal
Maturity date :[protected]
Address : bimalendu pal, 23 nilachal, po. Birati, kolkata, west bengal - 700 051.
Mobile no. [protected]