Unit Trust Of India — Redemption of rajlaxmi unit scheme

I had purchased 500 units of value rs. 100 each unit under Rajlaxmi Unit scheme o[censored]nit trust of india company. In the year 1993. Its date of maturity was 21/09/2013 for 20 years. But i did not receive any status of maturity amount of said scheme. I have original certificate with me. Kindly guide me how can i redeem said unit certificate and where should i claim it. I had purchased said units from pune