If your account is canceled and you still have a game out, it would be wise to either send the game back or reinstate your membership otherwise you are going to be charged for the cost of keeping the game. You can also contact customer service by email: email@example.com There is really no way around this, so I would strongly advise you to handle this issue before it becomes a real problem for you.
You probably need to contact support about this. If you can get the payment processed quickly enough you may not need to send the game back, but if you let it go too long, they're definitely going to want it back.
Moral of the story: keep enough money in your account if you don't want to lose the game you have.