I accidently subscribed to seventeen magazine?

Help! I was entering the code for monthly freebies on seventeen.com and i forgot to unccheck the box for a years subscription. I DO NOT want to pay for this! I canceled my subscription but the thing that popped up said i dont get a refund (but i never paid anyways). Will they send a bill to my house? I contacted customer service with my issue and they are yet to reply. Help?