No need to pay twice. Sometimes payment made by you takes 3 days to reflect with Zuperman especially if subscription paid through Amazon.
You can ask for refund from Amazon or whatever company site you paid and in the meantime you can send the receipt of payment made (you have received in your registered email ID) to zuperman at
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On receipt zuperman will unlock the game.
Next time pay the amount on completion of month and don't wait for the notification to appear as zuperman has given 5 days grace period after the subscription period is over to enable the players to play without any interruption.
If you received subscription payment notification, it means that you have crossed the grace period too.
EDIT: If you didn't get the receipt, it means the payment made was unsuccessful and the amount will come back to your account within 3-4 days.