Is it possible to challenge a refund?

Men who will speak with me for a day, view all of my content (my page does not contain any PPV, and I display everything; I do not deceive anyone), and then receive a refund caught my eye when I was looking at my refunds. A recent one requested to view a film that I had not uploaded to my page. I emailed it to him (again, no PPV), and he was reimbursed for his monthly fee. Is it possible to deal with this? Apart from blocking and reporting them?