Alchemist Infra Realty — maturity amount not received even after 15 years

Address:

734002

I mr, mukesh roy s/o, late ganesh roy, lower bhanu nagar. Ward no.43 sevoke road siliguri. P. O, ektiyasal. Dist - jalpaiguri. State : west bengal pin_734002l. My certificate of property allotment no. Airl / rdd0059124 dated 30/12/2010 beg to state that the certificate amount has already been matured and i would like to take the payment of my matured amount.
I had submitted the claim docs to the company on 14/3/2018 and they have duly acknowledged the receipt by signing and inputting a stamp. But today when i went to the said office premises it was locked.
My phone no is :[protected]