So dissapointed! I booked in Groupon two months ah...

So dissapointed! I booked in Groupon two months ahead and excited for my kids to visit this waterpark since we ve tried great wolf and kalahari but two days before the check in date called and needed to move the date because of work since I m in health care. I want to move it day after I booked or even asked if we can have late check out since we can t change the date but the rep told us they cannot help me because I bought the ticket from
Groupon. I don t understand why they can t help me where in the fact we will be staying in the same waterpark??? I d stick to kalahari and great wolf anyways.