Charged for annual membership I didn't want

Reunion.com charged my PayPal account for an annual membership I canceled well in advance of the renewal date. I wrote to them but they didn't reply. I want to have the money put back into my account. Several emails went unanswered.

I contacted Paypal and they contacted Reunion, but again no response. PayPal said they can do nothing.... How do I get my money back? There must be something I can do to reverse the charge.