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I'm not sure why your payment wouldn't go through, but this can happen if there are insufficient funds on your card, or if your card is not capable of international or online transactions.
If you are sure you have enough funds on your card, I would recommend that you please try upgrading your account once again:
Should that fail as well, I would recommend that you please try using another card. Let us know if there is anything else we can do to help. Thank you!