The standard rules are no refunds for games played more than 2 hrs. The first time you ask for a refund it's handled by an automated system. Ask for a refund again, and an actual staff member will review. So just try again.
I saw a screenshot of someone getting a refund with 90 something hours. Worth a try and see if they give it to you. Better then being stuck with a purchase you can't/won't use.
You might've gotten an automated denial due to exceeding the standard threshold for refund eligibility. Make another request until it gets human intervention.