Our refund policy can be found in our terms and conditions (Item 10) and is also written on each voucher:

LivingSocial will provide a refund if you change your mind within five days after you've purchased your voucher and want to 'return' the unused voucher. After that, we do not provide refunds except that we will provide a refund if you are unable to redeem a voucher because the merchant has gone out of business.