It isn’t your job to deal with ups. You didn’t ship it. Seller is responsible for shipping and arriving in good shape no matter what bs they put on tos. Get a refund and let them deal with it.You have a chance at 48 hours. Quickly act and don't stress the coral more. For example. I would not dip this one since that can cause more stress, but I have safe places to land them.
If you have a way, take the temp of the bag as soon as you open the box. A meat thermometer, heat gun or something accurate. It can tell you a lot.
You will not get a refund from any shipping company for the coral cost. They might refund the shipping cost, but sometimes they don't do that. Somebody just has to eat this as a cost of doing business. It totally sucks.
Many sellers build all of this into their costs and will make it right. ...one of the reasons why I hate it when people complain about frags costing so much since this is a real cost.