Domino's Pizza — gift voucher with same number issued to multiple persons

Address:

Mumbai City, Maharashtra, 400097

Purchased 2 gift vouchers of rs 500 each for dominos from the little app in the month of june 2017.

However, when i tried to redeem them it was not getting through. After multiple calls and email over a month they replied that the same has been redeemed by some person in kolkata and surat.

I have contact details of the person who have used the same gift vouchers that was issued to me and also paid to the vendor for buying the vouchers.

I want new vouchers of the same denomination