Non-Delivery of Groupon Product

I purchased a groupon for sushi - company name being CA Gourmet Sushi. The groupon incl delivery of sushi, bookings needing to be made 48 hrs in advance.<br> <br> Despite numerous attempts to book, using the email address provided on the groupon - I have not received my sushi. The owner of CA Gourmet (Ambrose) treats my mails with disdain - time and again he apologises for not getting back to me, offers a new date which I accept - and then cancels again. It is now farcical. In addition, I have written to Groupon to complain - 3 days later and still no response. They are as bad as CA Gourmet Sushi!<br> <br> No where to turn.