False Sales

I bought a food voucher last month and was in desperate need to use it yesterday. Voucher valid until end Dec...I tried to use it yesterday and the restaurant would not accept them saying they no longer in use Hyperli must refund me. I try to email them on the spot and this morn with absolutely no response from their support centre. I find ths totally unacceptable...as I was was left stranded and hungry and couldn't give a care in the world! Over and above this dilemma they did not have to decency to contact customers who bought these vouchers for a refund, this is tantamount to *****!