Unitech Group — fdr non payment

Address:

Plot no. 136, 2nd floor, udyog vihar, phase-1 Gurugram, Haryana-122016, Gurgaon, Haryana, 122016

My mother had invested 40000 in the form of a fdr
Fdr no. 1010607,
Folio no. 1009049
Rate of interest : 12.5
Period : 03/01/2011-02/01/2014

Company had given the interest amount of 18087 through cheque no. 102014 of idbi bank dated 03/01/2014.

Principal amount was reinvested with new fdr
Fdr no.1249418
Folio no.1009049
Rate of interest : 12.5
Period : 03/01/2014-03/01/2017 with maturity amount : 58087
There after nothing is received by her.
Even company is not giving reply to the email sent to her.
Kindly guide me so that my mother might not loose her invested money