IDBI Bank — no response from idbi regarding redemption of deep discount bond 96

Address:

Hyderabad, Andhra Pradesh

I invested rs.5300/-for deep discount bond 96 from idbi on 18 march 1996. The face value of same was rs.200000/_. The holder has the option to redeem the bond on any following dates
Aug.1 2000 at rs 10000/_
Dec.1 2006 at rs.25000/_
Sept.1 2011at rs.50000/_
June 1 2016at rs.100000/_
Keeping in view the above dates i have not approached idbi for redumption till now, moreover idbi has also not intimated me regarding discontinuation of deep discount bond. Now one of my friend told me about discontinuation of bonds accordingly i have tried to contact idbi on given address through email and phone but getting no reply.
You are requested please intimate me my further course of action.
Thanking you.
D. C. Lohani
[protected]