They'll fix it if you ask them. They always put the money back if there's been a mistake. Have you contacted staff?
They've stopped for me on several occasions. Let them know if something's going on man.
They'll fix it. They run an honest site.
Or solve this and get it for free xD
http://www.chess.com/forum/view/more-puzzles/i-will-gift-a-diamond-membership-to-first-person-to-win-this
or close account
hey.i was gonna post that but intercepted me