Great question! If the account is still frozen, then it does mean there is still an amount owing. While you may have paid for an outstanding balance, that would not have covered the upcoming month, which would result in a second charge. The second charge would be for the plan you have selected and would need to be paid in full before the account can be activated. The most common reason behind the charge not successfully processing the amount is due to insufficient funds or using an unsupported payment type (debit card with credit card capabilities are unsupported).
I'd recommend checking to ensure that you have sufficient funds on the card for the subscription charge (include currency conversion if your card is not in USD). If you believe you have enough funds to cover the charge, and the charge is still declining, then it would be best to reach out to your bank by dialling the number on the back of the card. They will be able to provide insight into why the charge is being declined.
If you have any issues along the way, let me know.
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