Sterling Tree Magnum (India) Ltd — refund for the amount invested

Address:

1-3-118, kalasiguda, secunderabad, 500003

Hello,

My father has invested for around 45 trees in the year 1994, amounting to Rs. 7, 560.
As the plan has matured 6years back, they haven't refunded any amount.
My father has complained regarding the same in February 2013, but to no avail. He has expired 5 years back.
Kindly look into the matter and resolve the issue by refunding us.