I bought tickets for my wife for a special occasio...

I bought tickets for my wife for a special occasion so we could go. She has been wanting to go to the water park for some time now. I didn't see any calendar on the mobile website and assumed since it's still summer for another month, why would they close. Well I bought them on a Saturday to go on Wednesday and the last day of being open, apparently, was on Sunday. When I called and asked for a refund they had me write an email. I explained to them the situation and they refused the refund and said that we could use the tickets for fright night and that the dates are on the ticket and should have read them. Without paying for a ticket then how would I see the dates? Why would I go, not having kids, to go on 2 or three adult rides, especially I paid quite a bit more per ticket? Really poor customer service. I am a local and will never give them any more money.