Bad customer service

I bought a Groupon for a boat trip. Unfortunately on the only day we could go the weather was not good so we could not go. We took up the matter with the supplier to get a refund and they referred us to Groupon which asked us for the details. We sent them the email exchange with the supplier, but since then Groupon's customer service seems to be ignoring us, replying to other matters, but not even mentioning this problem. <br> <br> In my mind this is extremely unprofessional.