Atmiya Institute Of Technology And Science — I have bonds which is not getting redeemed.

My father invested in various schemes o[censored]ti in 1990 i.e capital growth unit scheme 1992, children's gift growth fund unit scheme 1986, reinvestmemt plan 1966. I had tried to call uti customer care number many times but that is of no use. Want to know how to redeem this and what is the correct market value of this units now.