Expensive lesson man I’m sorry. I’m in the same sitch as you most of the time, I’m in high school and my mom temp acclimates for me. 2 hour DOAs really really suck and I honestly don’t understand why they even exist.
Always always always ask for the DOA policy plain and simple. Usually the seller will work with you in special situations or have your mom take pictures immediately and text them to you. I recently had a coral with a 2 hour DOA come in dead (bag leaked during shipping and there was no water left) and my mom sent me pictures and I was able to get it covered with the seller

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I do think that it’s kinda crappy of the seller to not help you out at all. I understand not fully covering it but I think you should at least get a discount on a replacement. Good luck