Traditionally, the act of resignation has always been final. You could contact the staff but I suspect they'll just ask you to be more careful, in future.
Contact link:
http://support.chess.com/index.php?_m=tickets&_a=submit
Undo resign
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I've now mistakenly resigned in two games by mistake on my iphone.
This has happened because the "next game" and resign buttons are right next to each other and I moved away from the game I was losing in to the next game unintentionally before resigning.
Is it possible to undo a resignation?