Domino's Pizza — unable to redeem e-voucher code on dominos bought from little app

I have bought 3 e-vouchers each value to 1000 inr from little app. However i am not able to redeem them as dominos isn't accepting e-vouchers as payment methods. Expiry date of those vouchers is coming soon.

I have dropped mail to dominos customer care mail id, but to my utmost suprise, they are not responding on the mail. Have taken multiple folow-ups but still no response.

I want refund of the amount in case you have issue with e-vouchers redemption, this is the issue at dominos side so atleast be accountable and fix this matter asap.

My contact no is [protected] for reference.