Gema Raspados

I purchased the Groupon Voucher Order#: *** which was listed as $10. I did the purchase with a number of other items so I would get a $10 discount. I went to the Gema Raspados to claim my $10 voucher which they failed to accept alleging the voucher was for the previous business that was open 6 months ego. Google lists their business as Gema Raspados just as it is currently listed on the Groupon website. We brought this to the attention of Groupon, but they would not help because of the $10 discount. We feel that Gema Raspados has cheated us out of the $10 voucher since we would have gone elsewhere if we had known they would fail to honor the Groupon voucher.