Domino's Pizza — I bought little app voucher for rs 425 worth 500.

I bought little app voucher for rs 425 worth 500. I wasn't able to claim it as there was an issue with the dominos website. I contacted little app regarding this, but there was no positive response, instead they told me to contact dominos. There was no direct number for dominos available for this issue, they told me to sent an e-mail to which i did but couldn't get a positive response. Now, today the deal got expired. I want a refund of rs 425 which i wasted on purchasing this deal.