LittleApp — little app - dominos voucher not working

Address:	AAKRUTI AMITY E305 ANANTHNAGAR PHASE 2 HUSKUR GATE NEAR ELECTRONIC CITY, 560100
Website:	littleapp.in

I bought 500 Rs Dominos Voucher from Little App and today when I'm trying to redeem the voucher it says Voucher already redeemed, I did not enter PIN also, how can it get redeemed?

I think Little App is looting customers and make fool of them.

If they cannot make it work, they should stop selling vouchers.

01-Apr-2019 is the last date to redeem the voucher. There is no way we can contact Little App.