UTI — i have units purchased in year 1996 by my father. i was minor. so how to redeem my units and get my payment.

As investment for my future my father purchased uti units in unit scheme 1964 clause 11 in the year 1996 when i was minor so how to redeem uti units today and how to get the payment.
What is procedure to get the payment and to whom to be contacted all the details i need it please update me about it. What all documents will be required and how much time it will take to get the payment in my account