ICICI Power Unit Certificate — How do I redeem the above certificate

Address:

Delhi

I have100 units of icici-power unit certificate with protfolio no. Pog17280 (Certificate no. 64464) in the names of sasidharan a and p bindu (Either or survivor). Issued on 1st october 1994.
Please let me know whom should we contact to redeem the units and what is the nav of the above scrip.